Android hints & tips

Following is a list of hints & tips that will make your daily life with android a bit better. Hopefully you will find this list useful and will save you a bit of time. I'm going to update this list every few days. If you think that something is missing or is incorrect, then let me know about it.
Note that I currently own an HTC HD2 phone which doesn't natively support Android, though I am using Android builds from XDA Developers that run on my phone. If you are interested on running Android on your HTC HD2, then visit android.hd2roms.com

List of Android hints & tips

1. Stop phone from rotating automatically
2. Stop phone from going into sleep mode while is charging
3. When running android builds on HTC HD2, some applications fail to install
4. Control CPU speed using SetCPU Application
5. Switch region in Android market
6. I cannot find Google Earth application in Android Market
7. Switching between running applications
8. Forced closing (killing) an application
9. I am using an Android Build on HTC HD2 and I keep losing the wireless connection
10. I am using an Android Build on HTC HD2 and my phone doesn't wake-up from sleep mode
11. Change the temperature unit in HTC Sense weather widget
12. Find HTC HD2 hspl version
13. How to stop notification sound for incoming emails
14. I am using an Android Build on HTC HD2 and the person who calls me listen his/her voice back
15. Recommended apps for android
16. How to install android on HTC HD2 phone
17. How to disable 3G/HDSPA when traveling abroad
18. Having problems with wireless connection or voice quality on HTC HD2 phone
19. My Android phone is out of space
20. All about SD Cards
21. I have another problem/question about android