Dennison Online Internet School
A middle school/high school for English literate students worldwide.

International High School
High school offering real-time personalized online instruction to individual learners throughout the world.

Compuhigh Online High School
High school with online courses and an accredited degree program

MU High School
High school online courses.

Eagle Christian School
Earn a high school diploma online.

Brigham Young University
High school courses offered completely over the Web.

Laurel Springs School
Web-based courses available for 5th Grade through 12th Grade and special needs, honors and college preparatory levels.

Mindquest
Online program for adults and young adults who want to complete a regular high school diploma, issued by a public high school

Internet Home School
A direct online k-12 instructional service for home schoolers

Montana Polytechnic Institute
Earn a high school degree online or transfer their course credits to other schools.

Francis Virtual School
Take on-line courses for credit and receive an accredited New York State high school diploma

CALCampus International

High school diploma program

This is a site that contains numerous links to various supplementary educational resources.  I love it.  If you can't find it here, there probably isn't one.

Road Map to the WEB

http://www.thejournal.com/features/rdmap