Out of the box, I noticed my Incredible has a lot of stuff running/turned on by default. Besides the basics of turning off WiFi, GPS, and BlueTooth when I'm not using them, are there more steps I can take to make my battery last longer?
In general, I believe reducing use of vibration helps save battery life on a phone. So for the Incredible, I even disabled the feature of vibrating when entering keystrokes.
Here are some good tips from wikiHow.
Switching to 2G when there's no need to use 3G networks is also increasing the battery life.
The biggest thing I've seen is to dim the backlight as much as possible (while remaining comfortable for your eyes), as well as lowering screen time-out length. Another big killer is to stay connected to wifi or 3g with a very weak signal. If it is at the point of losing connection and reconnecting repeatedly, it will eat through the battery very quickly.