wifi searching seems to kill the most battery for me
when I'm not near wifi, I have to remember to turn it off until I get home
Well at least you can just replace the battery.
unfortunately HTC dropped the ball with them type of.batteries. Use it until it fully dies then charge it while its off it will help. Also go to menu>settings>accounts&sync>disable background data. you will have to manually refresh if u want to check email but it saves batery life.considerably.
Heard the Note II has a great battery. I'm thinking about getting it next.