We've noticed that the Achievement System for Life app - aka Booyah Society - is currently offering a lot more than just in-game achievements.

Over on its Facebook page, a sweepstake for $1,000 is running for those who register and invite three friends to do likewise.

This prize is split into $500 of Apple Store credit for you, and the ability to give five friends $100 of Apple Store credit each, although as Booyah has raised $4.5 million in venture funding, it's got plenty of money to burn at the moment.

Of course, you have to register - i.e. fill in your name, email and date of birth - to be in with a chance to win. And you have to have a Facebook account.

The sweepstake will close and the winner will be drawn on August 27, 2009.

Alternatively, for free, you can check out our interview with Booyah's CEO Keith Lee over on PocketGamer.biz.

Or hit the Buy It! button to get the free Booyah Society app on your iPhone or iPod touch.