EDIT: CAGs, we really need to get this iPhone social networking community working for us. We obviously are all enjoying iPhone games, so why not actually get the most out of OpenFeint and Plus+ together? I've added my OpenFeint and Plus+ IDs to my signature, so feel free to add me and send me a message letting me know you're a fellow CAG! Then post your IDs here, too. The social networking is a really cool addition to iPhone games with the achievements and challenges, but it's a lonely implementation without any friends on! CAGs find each other!
EDIT2: And since my signature doesn't always show up, my OpenFeint and Plus+ IDs are loesjoel
Great idea. I wonder if we can add it to the sidebar (similar to your wii/xbla tag). I have sigs hidden.