If you haven’t kept up with the mobile market, we got news for you—Google's mobile OS is kicking ass. That’s right. Andy Rubin’s operating system, which Symbian, Nokia, Microsoft, and yes Apple, considered “no major threat” a few years back is now the leading U.S. mobile platform. But Android phones aren’t just killing it on American soil. Recent reports from Gartner have the mobile OS selling over 427.8 million units worldwide in just the first quarter of 2011. The little OS that could has definitely come a long way since 2008 when the first-ever Android device, the T-Mobile G1, was released.

Last year we looked at the market and picked out what we thought were the best Android phones. That list included powerhouses like the HTC EVO and the Droid Incredible. One year later, we’re ready to break down the next batch of industry-leading handsets. Dual-core processors, 4G connections, Gingerbread OS, and accessories that enhance the mobile experience—if you want it, there's an Android phone out there for you. But before you head to a store looking for your next handset, check out the Top 15 Android Phones Available Now.

Check back on Monday (5/23) to learn how you can win one of three HTC, Motorola, or Samsung Android phones.