It's an old Thread so most of these have probably been covered but

- Worldmate : tracks all your travel, alerts you automatically of flight changes. it's $10 per year OR if you book a hotel through them you get 3 months free
- Gateguru : lets you quickly find out every dining option at the airport. great for when you really don't want to eat at the food court OR you're stuck in ATL for 2 hours and have to have ice cream
- Evernote: Let's you take notes with pictures, video, etc. you can email yourself notes, upload from your browser, etc. great for saving online articles to your phone to read later while in the plane

Since this thread is large and unwieldy, please continue following it in the new thread:

http://www.flyertalk.com/forum/trave...droid-app.html