Those people are great! You can submit your soldier for a free ac unit, the soldier can submit himself, or you can adopt a soldier.
Relying on donations only - they have an easy to use donation platform imbedded.
Who they are:
"non-profit Delaware company operating on donations only, sends 110v single phase air conditioners to our troops in Iraq. They also send medical supplies to the Combat Support Hospitals for both injured American Soldiers and for the staff, as well as various basic items the soldiers request and desperately need."

Australian Forces

• This official web page allows you to send messages of support to the 800 or so troops engaged in "Operation Catalyst" to rebuild Iraq, or to send messages in support of service families left in Australia. Some of the March-April messages may be read here.

British Forces

• Support-a-Squaddie (british slang for soldier) connects you to British forces for care packages, letters, etc. (Hat Tip: Jonah Goldberg at The Corner)

• The UK Forces Gulf Fund has been set up to provide welfare support to UK Service Personnel taking part in Operation Telic in the Gulf and their families. It's run by the Veterans' Agency of the Ministry of Defense. The donations page is here. (Update Hat Tip: Eddie Cochrane)

• Books for Soldiers, match up Amercan & British troops with the spare books, novels, et. al. we donate.

• "This Bulletin Board is provided by the British Forces Post Office to enable the public and friends and family to post messages to our troops serving all over the globe. Upon receipt, these messages will be reviewed for appropriate language and content and you may experience up to 24 hours delays for posting and viewing."

• The troops aren't the only ones taking fire for being in Iraq to help the USA. Send letters of support to Tony Blair, and tell him "thank-you!"

Canadian Forces

The Canadians are currently based in Kabul, Afghanistan, with a contingent of around 1,700 plus 200 elsewhere. They are part of the ISAF multinational force, and are easily distinguished by their green camouflage uniforms. Here is the Operation Athena Home Page.

• John Macdonald says: "Maybe you can post this site [for sending support message to the troops] along with the sites for troop morale that you already have listed. Thanks!" Non-Canadians are also welcome to post, of course.

Danish Forces

Ole Sanvig writes:

• "Stumbled across the post today, and just thought I'd add in the mail adresses for the Danish forces in Iaq and Afghanistan. Iraq: IRAQ-DANCON@]MIL.DK or NSEIRAQ[at}MIL{dot]DK. Afghanistan: ISAF@MIL.DK. Should anyone feel compelled to drop a line to the 700 or so Danish soldiers serving these missions, I'm sure they'd be happy."

Polish Forces

• Want to show your appreciation to the Polish soldiers for all they did and all that they're still doing in Iraq? We have a post that explains how you can help them.

• Winds of Change.NET has been working closely with Spirit of America. They're assisting the U.S. Marines deploying to the Sunni Triangle with toys and other helpful giveaways, helping Iraqi women start small businesses, helping Iraqi men enter building trades, etc.

• Chief Wiggles' is still about "sharing joys with toys" for the children of Iraq, Sri Lanka, and beyond!

• Overstock is supporting Chief Wiggles' Operation Give too. They're like an online outlet mall, receiving excess inventory from manufacturers and making it go away by selling it for less. You can buy stuff on line and have it donated to Operation Give or sent to the troops in 1 step. Overstock.com has also become one of the biggest employers in Afghanistan. (Hat Tip: Tanker Schreiber)

• The Chief isn't alone, and several organizations are focusing on schools. IraqiSchools.com is another soldier-based effort, designed to being desperately needed school supplies to the children in several large zones in the heart of Baghdad. Similar efforts are underway via Iraqkids.org (American Aid for Children of Nineveh, a 501c3) and Iraqikids.org (run by a unit of 1st Cav).

• In Afghanistan, soldier/blogger Sgt. Hook is running Operation Shoefly to give Afghan children shoes for their feet.

          Army Activates Family Assistance Hotline (FAH): USACFSC activated the
          24 hour Family Assistance Hotline (FAH) 21 March. The FAH (800-833-6622)
          is a "safety net" for family members of active and reserve component soldiers
          seeking information or assistance while their soldier family memeber is 
          forward deployed. USACFSC mans the FAH 24 hours a day.
          1-800-833-6622 

Some of the organizations in this roundup will take your donation of money or goods and take care of the shipping themselves. If that isn't the case...

• AnySoldier.com's "How To Send It" page is the best resource I've found.

• The U.S. Post Office will give free packing materials to spouses, families and friends of military members deployed overseas, and offers some instructions and tips on mailing packages overseas.

• Overstock.com will ship materials directly to APO/FPO addresses.

• Afghanistan can be cold - and so is Iraq's desert. Do you sew, knit or crochet? Want to make something and send it? If so, The Ships Project are the people for you. $60,000 in postage costs so far... that's a lot of stuff. (Hat Tip: Jennetic)

Want to know what to send, how to get it there, etc.? Anysoldier.com has the information you need. They have grown to 3,616 Military Contacts (approx. 2959 Army, 414 Marine, 179 Air Force, 64 Navy, and 0 Coast Guard) who are helping approximately 113,714 soldiers!

• Team Stryker points to Books for Soldiers, who matches up Amercan & British troops with the spare books, nivels, et. al. we donate. Paul says: "I know that I welcomed the occasional box of books we got from "back home" when I was deployed to the sandbox, and I'm sure the folks deployed today are no different in that regard." (Hat Tip to Angua's First Blog for noticing the broken link)

• Donate to "Operation USO Care Package"

• Better still, Inkgrrl reminds us that you can work directly with a more specific group of soldiers via the moms at Adoptaplatoon.org. See "Moms Across America" for the origins of this group.

• Even more specific: adopt the Stryker Brigade, the ultra-modern force with the new Stryker troop carriers that's currently serving in Northern Iraq.

• Army Camp Doha in Kuwait also has a roster of specific rear-echelon units you can support, along with their requests. I particularly noticed the 355th squadron of the US Air Force - 1/4 of them are female, and they haven't been receiving much....

• Operation Military Pride is an umbrella organization that coordinates messages and care packages itself, and also provides assistance to others who wish to do so. They're a good source for people who want to start up a "Support the Troops" effort in their local area. (Hat Tip: Lou Villadsen)

Note that OMP do not appear to be a registered charity, but they are listed on the U.S. Department of Defense America Supports You site and I receive their e-newsletter.

• Operation Gratitude takes donations, and sends care packages. It started as a one-woman operation...

• Sometimes being posted abroad is a major financial hardship for a family, and they end up needing help to make it. Helping ease the burden of our military families in need is the mission of the Veterans of Foreign Wars' Unmet Needs Program.

• The Military Child Education Coalition is a 501c3 non-profit, world-wide organization that identifies the challenges that face the highly mobile military child, increases awareness of these challenges in military and educational communities and initiates and implements programs to meet the challenges. MCEC's goal is to level the educational playing field for military children wherever they are located around the world and to serve as a model for all highly mobile children.

• The Fisher House Foundation is described as "Ronald McDonald House for wounded soldiers and their families." It donates comfort homes built on the grounds of major military and VA medical centers. These homes enable family members to be close to a loved one during hospitalization for an unexpected illness, disease, or injury. And you should really read Kim du Toit's report of actor Denzel Washington's May 2005 visit to a Fisher House - he asked how much it cost to build one, then simply took out his chequebook. Impressive.

• As reader Glen Wishard notes, The Wounded Warrior Project assists men and women of the U.S. armed forces who have been severely injured during the conflicts in Iraq, Afghanistan, and other hot spots around the world. Many of the injuries are traumatic amputations, gunshot wounds, burns and blast injuries that will retire these brave warriors from military service.

• Note that there are special contracting set-asides for businesses owned by service-disabled veterans, and they are currently underused. Defense Industry Daily has the briefing, plus links to useful resources.

• The Tragedy Assistance Program for Survivors, Inc., is a one of a kind non-profit Veteran Service Organization offering hope, healing, comfort and care to thousands of American armed forces families facing the death of a loved one each year. TAPS receives absolutely no government funding, but through the Departments of Defense and Veterans Affairs, all families faced with a death of one serving in the Armed Forces receive information about TAPS and our military survivor programs. Ben Stein writes about a Memorial Day event with them, and what it meant to him.

CiviliansIn Iraq is a Yahoo! group that has come together as a support service for civilian contractors who are working in Iraq.

• Donate a calling card to help keep service members in touch with their families at Operation Uplink;
• Send a greeting via e-mail through Anyservicemember.org or Operation Dear Abby;
• Sign a virtual thank you card at the Defense America web site;
• U.S. troops deployed to the Persian Gulf region and other overseas locations can now receive messages from family members, friends, neighbors, colleagues and supporters via the pages of Stars and Stripes Magazine. "Messages of Support," a daily section that debuted March 17, gives family and friends of deployed service members a chance to pass their greetings, words of encouragement and announcements free of charge.
• Or, to kick the technical support up yet another notch, how about video conferencing thanks to the Freedom Calls Foundation.