I just joined Cookbooker. It is a site for managing your cookbook library and reviewing recipes you cook out of cookbooks, magazines and even websites. It seems like a good resource for keeping track of favorite recipes and also recipes you’d like to try from the cookbooks you own. I like reading other peoples’ reviews of recipes in my cookbooks and becoming inspired to try a recipe I might otherwise have skipped.
Cookbooker currently has almost 600 members. I see potential there for becoming something like the LibraryThing for cookbook enthusiasts. But a lot more people need to join first.