I know, comments on an old post, but I’m developing a Rails app at the moment (more of an exercise in rails) which isn’t quite as complex as your original idea (no users, thus wiki style, no friends, no auto RSS feed aggregation, maybe article voting) but still interesting in that it will hopefully become an index of Cocoa resources. A bookmarking app, essentially, with a Cocoa focus. If you’re still interested in something like this send me an email and maybe you could share some ideas. Basically I wanted to make something which would save me from random google searching error messages and framework names and getting back heaps of irrelevant results related to other technologies, when I know perfectly well there’s an article out there related to Core Data and multithreading techniques (hello! I just read your blog now for the first time!) but not finding it. Whereas if your article was tagged core data threading in this index it would have appeared straight away.