TechCrunch reports that the company launched in April, and solves the problems that arises when developers switch between different ad networks. Typically after switching, you have to re-issue the updates to Apple (NSDQ: AAPL), which may take a couple of weeks to approve. Instead, AdWhirl allows developers to switch ad networks without going through the approval process. So far, it supports five ad networks: AdMob, Quattro Wireless, Videoegg, and Jumptap. Millennial Media and Google’s Adsense coming soon.

Since launching two months ago, AdWhirl has amassed a list of publishers 1,000 and has helped deliver more than one billion ads each a month to free apps to the iPhone and iPod. Right now, AdWhirl doesn’t charge for its services, and let’s developers rotate between ad networks as much as they like. Developers can also set up AdWhirl to automatically switch between ad networks to optimize CPM rates, or when inventory runs out on a particular platform.