Stare at the stars with , the "mobile planetarium" for Android phones. The , free, actually overlays information about the night sky onto your Droid display. It uses a combination of GPS data, compass data, and date and time information to help you identify planets, stars, and constellations.

8. KeyRing

Get rid of all those annoying membership cards with , an Android app that puts your barcodes into your . Simply scan your various cards -- anything from gym memberships to drug store discount clubs -- and Key Ring will categorize them into a drop-down menu.

The next time you need a card, you just pull it up on your phone -- no need to actually carry the physical piece of plastic.

9. Compare Everywhere