Here is just a sampling of links. Some of these I found on Discover Interpreting, and some of them I found on my own. I just found a page full of links on Omniglot, so I shall give you this list for now, recommend you check out the Omniglot links to websites about signed languages and manual alphabets around the world, and welcome you to post responses with other resources you think should be listed.
- About Deafness: deafness.about.com/
- American Sign Language Browser (dictionary): commtechlab.msu.edu/sites/aslweb/browser.htm
- ASL Video Dictionary and Inflection Guide: ntid.rit.edu/dictionary
- British Deaf Association: bda.org.uk
- British Sign Language Corpus Project: bslcorpusproject.org
- Deaf Studies Digital Journal: dsdj.gallaudet.edu
- Deaf West Theatre Company: deafwest.org
- Discover Interpreting: discoverinterpreting.com
- Dr. Bill Vicars’ American Sign Language Fingerspelling Practice Site: asl.ms
- Dr. Bill Vicars’ American Sign Language University: lifeprint.com
- Gallaudet University : gallaudet.edu
- HandSpeak: handspeak.com
- Everything You Wanted to Know about Deafness: zak.co.il/d/deaf-info
- International Bibliography of Sign Language: sign-lang.uni-hamburg.de/bibweb
- National Technical Institute for the Deaf (NTID): ntid.rit.edu
- Omniglot links to websites about sign languages and manual alphabets: omniglot.com/links/signlanguage.htm
- Signing Savvy: signingsavvy.com
- Subject-Based Deaf and Hard of Hearing (Internet Resources/RIT Library web portal): wally.rit.edu/internet/subject/deafness.html
Is there anything else you think should be listed here? If so, please leave a link in a comment.
Daniel Greene 
Comments welcome