Apple just announced Game Center, which is a social gaming network for the iPhone -- it sounds a lot like Xbox Live, actually. It's has a friend system, leaderboards, and achievements -- and we're guessing it'll blow up out of the gate, given how many games are on the platform. It's being previewed in iPhone OS 4
right now, and it'll launch later this summer. We're hunting for more info, we'll let you know!
Apple demos Game Center for iPhone OS 4.0
Make sure to check out the ongoing iPhone OS 4.0 liveblog