aka, Food Porn. This is a LiveJournal community with tons of great recipes, photographs and cooking information. Definitely worth the time to at least take a look.
Chefs Like Me! is also a LJ community that just started up, but looks to be a lot of fun. Right now it’s a lot of introductions, but they’ve also got the first “food of the week” out there for research & discussion, and a challenge: pies. Since it’s brand new, you never know where it may end up, but I really think it’s got a lot of potential to be a fun forum.