Apple's taking aim at the Xbox integration coming to Windows Phone 7 with its new Game Center. This new service will allow online play on your iPhone, complete with leaderboards and achievements.
Basically, this service will take control of online game play from app makers. Rather than pairing you up with someone to play with in each game, you'll go to the game center, pick which game you want to play, and it'll set you up with someone to play with.
There will also be unified leaderboards and achievements, which as we know are a great way to get people nice and addicted to their games. It should be launching "later this year," so it's not clear if it'll launch this summer with the rest of iPhone 4.0.