Here are my own tips: 1. set the brightness level to either minimum or to Auto. 2. stop all apps that require an internet or wi-fi connection (like Weatherbug, Google Maps/Latitude, Facebook, Twitter et al) whenever you are at work or have a weak signal area. 3. Turn off GPS. 4. Avoid those Live wallpapers as much as possible. just the plain wallaper would do unless you wanna show-off your phone to your pals. 5. Set the Screen Off to 15 seconds. the longer it turns off the more it uses battery. 6. install a task killer to stop all apps running in the background (or otherwise) thus saving battery life. 7. if you are on a weak signal area turn on your wi-fi. any more please...?