Back when Apple first introduced Game Center, one of the first big questions was if apps that weren't actually games could use the service to share achievements and even leaderboards from user to user. Since then, there have been a few examples of this poking around, but this is probably the most blatant: a new app called 100 Cameras in 1 offers not only over 100 Instagram style "effects" for your iPhone 4's camera, but full Game Center integration as well. Unfortunately, the limit isn't really being pus
