http://www.sherlockology.com -- a website for the BBC tv series.
htttp://sherlockology.tumblr.com -- check for information about the upcoming debate. The teams are BBC, Ritchie, and classic portrayals. Might be interesting.
http://sherlockholmes.stanford.edu/readings.html Includes some interesting notes for each of the stories it covers.
http://sherlock.mindcop.net The Sherlock Holmes public library. Has links to a lot of the audio versions. The one I'm listening to at the moment is Bruce and Rathbone and Watson has assumed a Scots accent to hold up his disguise.