Rovio have announced the availability of Rovio Account services for all Android & iOS users Worldwide.
You will now be able to sync your game progress across your devices. At the moment it is only available for two of their games.
The games which have these service are the original Angry Birds and The Croods.
How to create a Rovio Account:
Open the Angry Birds game, and tap on the account button, and follow the on-screen instructions.
(So far I haven’t gotten this button on the game, perhaps they will push an update for this)
Open The Croods game, and tap on the “Register” button on the bottom of the screen.
Note: You have to click on the verification link which you will get in your email inbox.
They have said that they plan to roll out this feature for all of their titles soon.