Cattail's Origami Page. 
Lots of great links!
http://www.cattail.nu/origami/index.html

Origami-Club
Great Origami website all in Japanese. It has animated directions for lots 
and lots of origami. Just click and play around.
http://www.origami-club.com/

Origami-Instruction Site:

http://www.origami-instructions.com/