Rovio has launched their game synch service, Rovio Accounts, and you can now keep your progress between iPhone and iPad, iOS and Android on both the original Angry Birds game, and Croods. From the [Rovio blog[(http://www.rovio.com/en/news/blog/344/rovio-account-now-available-worldwide-on-android-and-ios/):
I'm playing Infinity Blade on my iPhone 4 but if I switch to my iPad I have to start the game over, fresh, as if I'd never played before -- it makes me hope Game Center in iOS 5 will sync my game state between devices so I can just pick up any of them and keep playing from where I was. Not just for Infinity Blade but for Angry Birds and Angry Birds HD and tons of other games. All of them, actually.