There are a variety of iPhone services linking various games to one another in an Xbox Live or PlayStation Network-like interface with linked friends, achievements, etc. Apple has thrown a wrench into those plans, however, with their own social gaming network, entitled Game Center.
Game Center was unveiled this morning as part of Apple's iPhone OS 4.0 event.
The social network includes everything you'd expect and want from a cross-game network, based on other network successes: achievements, matchmaking, friends lists and leaderboards.
iPhone OS 4.0 is scheduled to launch sometime this summer.
This could be huge for games. But what happens to existing networks like plus?