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If you have a rooted device, you owe it to yourself to look into ROM Manager. With the help of a great UI, it lets you easily apply nightly builds. It also makes switching ROMs a snap and you can even back up your ROMs.
If your Android device also serves as your music playback device, you owe it to yourself to install Poweramp. For me, this app is worth it just for the 10-band graphic EQ. For others, the vast number of supported formats will make this a must-have music app. You will also find plenty of other features, such as outstanding OpenGL-based cover art animation and gapless playback.
AirDroid is a handy little app that lets you take control of your Android device from within a Web browser. The PC and the mobile device must be on the same wireless network, but once you have AirDroid working, you will find it an easy way to work between your PC and your mobile device.