Crank up the tunes on your new Droid immediately by installing , available for free in the Android Market. Like its online and on-the-iPhone counterpart, the Pandora Android app lets you listen to personalized radio stations based on your favorite artists or songs. Thanks to Android's , you'll be able to rock out while running other apps -- something the iPhone can't handle.

4. Google Voice for Mobile

File this one under too. The official app fully integrates into your new Droid phone. Once installed, you can make outgoing calls from your Google Voice number with the touch of a button, right from your contacts list. You also gain easy access to voicemail and Google Voice-based SMS messaging.

The Google Voice for Mobile app is free to install and use. You do need to have an existing Google Voice account, however, for it to work.

5. Locale