The winners of the Google Android Apps Developer Challenge each receive $275,000. 

1. Cab4me.com - Ever been looking for a cab? cab4me is the answer. Anywhere. Anytime.
http://www.cab4me.com/

2.  CompareEverywhere - Shop smarter using your phone. Compare prices, read reviews, and connect with local stores.
http://compare-everywhere.com/

3.  Ecorio - Ecorio automatically tracks your mobile carbon footprint, suggests transit and carpooling alternatives and lets you stay carbon neutral by offsetting your trips easily.
http://www.ecorio.org/

4.  GoCart - Scan a product’s barcode with your phone’s camera and view all the best prices online and at nearby, local stores.
http://www.biggu.com/

5.  Life360 - From major natural disasters to little things like your child wandering away at the mall, there is a lot you might worry about. Life360 can help.
http://www.life360.com/

6.  Locale - Locale is an advanced settings manager that automatically changes your phone’s settings based on conditions, such as location.
http://www.androidlocale.com/

7.  PicSay - Easy to use image editor that enables you to quickly personalize your pictures and share them with friends or photo sites.
http://www.shinycore.com/picsay/

8.  SoftRace - Turn your workout into a thrilling race and challenge the world in real time.
http://www.softrace.net/

9.  Tunewiki - TuneWiki Social Media Player, is an advanced player, featuring synchronized lyrics for audio or video, translation, music maps and a social network.
http://TuneWiki.com/

10.  Wertago - The mobile application nightlifers have been waiting for. Find the hottest parties in town and connect with friends and others all night long.
http://wertago.com/