The Aurora Feint folks are at WWDC with the rest of the Mac development world this week, and while out there, not only are they having a party, but they sent out an announcement: OpenFeint 2.0 is out now, and it has some "social discovery" features now included. Their open platform already supported doing things like leaderboards and profiles from directly within iPhone applications and games, but now the new release will also allow users to bring their friends lists in from Facebook and Twitter, update profile pictures of themselves, and both find their friends and figure out what they're playing. The system is free to integrate into iPhone apps and games, and there's a user-based model that costs more at higher levels.
OpenFeint isn't the only system attempting to do something like this (be a sort of Xbox Live for iPhone games), but they are certainly the biggest, with more developers jumping into their boat every day. And as is the way with social networks, sometimes being the biggest is just as good as being the best. Look for their features in an iPhone game near you.