1. No animated wallpaper. Use something static and dark. (AMOLED models)
2. Root + SetCPU + Screen off profile with low cpu (mine set to 499 max)
3. Minimize always-on connections like Facebook, Yahoo, etc.
4. Use Gmail instead of POP/SMTP to minimize sleep radio use.
5. Get something to put Wifi/Bluetooth widgets within easy reach. Turn them on and off as needed.
Dial *#*#4636#*#* > Battery History > Partial Wake Usage (PWU). If you are running an "efficient" phone "Android System" will be listed first, followed distantly by your other tasks. If other tasks are close to, or exceed, Android System in PWU, then you are burning battery unnecessarily while the phone is sleeping.
If you still need more battery life, consider an extended battery. There are many to choose from, and they are quite inexpensive now.
Good luck!