There are many websites like ASLPro:
ASLPro.com Home
As far as dictionaries, there are many publishers... like Gallaudet Press, TJ Publishers and so onand they do update their stuff from time to time-- just like any other publisher.
Now if you are expecting a yearly publication-- there is a problem with that. English dictionaries are published every year because it is absorbing new words at a pace that is incomparable to other languages-- Standard Chinese and Kanji are probably the closest that can match English.
Many people who specialize in the study of English have a library of different published dictionaries from different time periods. No different than ASL.
I use [ame=http://www.amazon.com/American-Sign-Language-Dictionary-Unabridged/dp/0062716085/ref=sr_1_3?ie=UTF8&s=books&qid=1253045415&sr=1-3]Amazon.com: American Sign Language Dictionary Unabridged (9780062716088): Martin L. Sternberg: Books[/ame]
and
[ame=http://www.amazon.com/Canadian-Dictionary-ASL-Carole-Bailey/dp/0888643004/ref=sr_1_6?ie=UTF8&s=books&qid=1253045321&sr=1-6]Amazon.com: The Canadian Dictionary of ASL (9780888643001): Carole Sue Bailey, Kathy Dolby, Charmaine Letourneau C.M.: Books[/ame]
I also pick up supplementary materials that come from Gallaudet, TJ Publishers, Random House and few others.
I got a chance to see an interpreter's personal collection once, and it was a 8' tall 4' wide bookshelf that was just riped with DVDs. The amount of printed materials she have, which were anywhere from 1923 to 2007 were just scary.