The popularity of Android phones exploded in 2011, with new device activations topping over half a million a day worldwide. So it's not surprising that a mountain of Android apps is out there, including plenty of quality downloads that don't cost a thing.
I weeded through all kinds of new titles for 2011 that are available for free. The categories ranged from productivity to social and sharing apps, photo editing and management, and, of course, games. From that field, I came up with this list of keepers. Let's start with music.