Thanks to Hugh Sung, there is now a collaborative pianist group on Myspace.com. We collaborative pianists are generally not an organized bunch, and there are few online resources and communities (although there is a fine list of Piano Accompanists in England, Ireland, Scotland, and Wales).
I heartily recommend all collaborative pianists/accompanists in the profession, whether student or pro, to join this group and see where it will go, whether it be a recommendation service, an exchange of ideas and concepts, or just a place to go and bitch about things. Note that anti-spamming measures mean that new Myspace members cannot post to the site until 7 days after registering, so there will be a lag between when you sign up and when you can actually participate. 33 members and counting as of tonight!