http://www.lifeprint.com. This is an entire class in ASL with lots of stuff. There's books, newsletters, an ASL dictionary, Deaf jokes and much more. Definitely worth looking into.

ASL Browser. This is a video ASL dictionary from Michigan State University's. It has more than 2500 video signs covering 4500 English words. Better yet, buy a small dictionary to carry around with you.

aslpro.com

ASL Literature Page. This page has videos of short stories told in ASL. Not a bad place to practice.

Fingerspelling practice. This is a great tool to improve your ability to read fingerspelling.

Deaf Linx. Lots of good information here.

Guide To Sign Language Communication, and more good information and links.

More good information about ASL.