This French site provides a nice overview (with photos) of the many folkloric afro-cuban dance styles. This is the google translated version and very readable. Be sure to also click on the Orisha Dances, which gives a description of the dances for each diety.
This is an ethnomusicology treasure. Soooo many videos, mostly done on a camcorder and shot at private residences, parties, and ceremonies. Excellent resource for those interested in Rumba, Santeria, and Afro-Cuban Percussion. Very raw and exciting. Site has video clips. Primarily demonstration and instruction for Afro-Cuban Percussion, but there is a lot of dancing as well.