The world of Android

1. How to properly set your Task killer in Android
2. Complete guide to maximizing your Android Phone battery.
3. Using Geocoder and GPS
4. Android Developer Tutorials - Menus and others
5. Developing for Google Android OS
6. 10 Tips for developing Android apps
7. Android - OpenGL
8. Android Community Forums
9. Creating Sound Effects in Android
10. My favorite Android tutorial (Thanks to Lars Vogel)
11. Color example in Android
12. The DB for the Android or mobile devices

13. Face Detector in Android
14. Race Game
15. Make your own Android Widget
16. Best set of tutorials from Developerlife
17. Rooting your Android Phone 
18. The fun of Rooting your Android device (FAQ)
19. Android Location providers - GPS, Network
20. Threads and design patterns for Android - a good tutorial
21. Android Videos