Google's no stranger to some pretty awesome competitions.
If you're a gifted coder/programmer and want to solve some complex algorithms for a chance to win some dough, you can check out their Code Jam. If marketing's more your thing, they've got a contest for that too. Android developers can make a pretty penny with this competition as well.
But there's one Google competition that stands above the others when it comes to sheer adorableness, and that's their Doodle challenge.