Registration for the Open AIM Developer Challenge has surpassed the 150 mark, but it's not too late to get in on the action. With just two passing submissions so far, there's plenty of opportunity for you to submit an app for a shot at one of the nine $10,000 first prizes or one of the 20 $500 second prizes.

Remember, usage of your app is 20% of your total score, so the earlier you submit, the better chance you have to build up the numbers in that category. Plus, everyone who submits gets a free TopCoder/Open AIM t-shirt, so jump on board now!