Motorola Droid 2

1. Firstly, If you have any accounts set up through motoblur (when it asked you if you wanted to sync any accounts after activation) you want to remove them. Motoblur account sync DESTROYS battery. Unless you really love the motoblur all in one widgets there is no reason to have it. Once you do this, download and install Facebook/Twitter/whatever from the market and sync through them instead.

2. Go into settings and go to brightness. Turn off auto-brightness. and set the brightness to the lowest ammount you can comfortably read indoors. Don't force yourself to strain, but around 40% seems to be ideal for a lot of people. Then go to one of your homescreens and add the Android Power control widget. The toggle has three settings. Minimum (0% on that slider), User Defined (your 40%), Max Brightness, and Auto-Brightness. Press on the icon a few times to familiarize yourself with how it acts. Keep on User Brightness for any time you are inside, and then switch to max if you are navigating or outside.

3. White is very hard for screens to replicate, so darker backgrounds require less battery to display. Static backgrounds use less energy than live wallpapers. LWP are awesome, but if you need that extra juice, consider this. Remove all widgets and shortcuts from your homescreens that you're not using. For example, if you love pandora, but never manage it using the widget, just put a shortcut on your screen and not the widget.

Hope these help.