Scott Jennings – http://brokentoys.org/ – Infamous MMO design commentator (LumTheMad), now a professional game designer, blogs a lot on the social issues inside the major MMOs, with a balanced perspective between player desires, real behaviours, designer wishes, community attempts to balance it all, and practicalities of support and implementation. Somewhat similar to Damion’s blog, but leaning more towards the player and community-manager perspectives where Damion leans more towards the designer perspective.

Alice Taylor – http://www.wonderlandblog.com/ – commentator on all forms of social gaming, social behaviour in WoW, and Alternate Reality Games etc. Also is/has been actively responsible for funding some of the more innovative projects (previously a commissioning editor for BBC, now at Channel4 IIRC), but she’s also an active WoW player/addict/guild leader, so has a pretty broad view on things.

Adrian Hon – http://mssv.net – lead designer for PerplexCity ARG, writes often on issues of writing for games from a modern literature perspective, and on subverting all sorts of aspects of every day life to be used in gaming.

I also (shameless plug) occasionally cover social gaming and design issues at http://t-machine.org, but at the moment on those topics I’m mostly just doing detailed writeups of other people’s talks , and keeping quiet for myself.

PS: this blog doesn’t allow hyperlinks in comments. Sorry, you’ll have to copy/paste.