I've recently joined a community for browser-based games developers. I've had to fire up IRC for the first time in a while, but IRC has that kind of nostalgic hot-chocolate-by-a-snowy-window comfortable feel to it, doesn't it? Well, that might just be me, I don't know. But, at any rate, there's always a good conversation going on in the IRC channel or in the forums, so if you're interested in browser-based-games development, it's definitely worth checking out.
The IRC channel is #bbg at irc.freenode.net (web client here) and the forums are at community.bbgamezone.net. One of the members also maintains a list of games that some of the members have / are developing at fleetingfantasy.com/game-list.