Hmm, I guess White covered most of it but...
I'm a user of the Desire Z/Vision (HTC Branded G2 with Sense UI...) so I thought that I could tell you what I usually do...
I went from a HTC Desire to this, my old desire's battery had a 1400 mAh battery, vs my Z with a 1350 mAh battery and 'only' 800 MHz CPU clock.. But I must say, even though this, The performance is rather equal or higher while the same applies to also the battery time!
- Unless it's too bright outside, I
always keep my screen brightness to 10%, sometimes 25% tho...
- I use a relatively dark background image, and I try staying away from live wallpapers..
- Wifi and bluetooth is off unless I use it
- I usually keep 3G and background/auto sync on, but disabling this could save you an hour if not more!
- I have however manually disabled auto sync for all stuff I don't use, twitter and facebook and similar stuff I do use is set to once an hour, gmail is the only one I have set for real time updates, other stuff I have set to wifi only or several hours between each update
- I frequently use a task killer every now and then, and make sure to kill as much as possible without killing too much so that the phone is left unstable.. usually helps save a few minutes to an hour or total battery time, I also make sure to kill the task killer so that it doesn't drain anyting as some task killers are know to do
- I have dried a few apps claiming to save some battery time, but I have never settled with any
- I keep a charger in my pocket in case I'd run low on battery and would get a chance to charge, but it isn't very often.. I'm just paranoid
- With all this.. I last atleast a average day of school (8:30 am to 2:30 pm) and have plenty of battery when I get home
- I have survived over 9 hours and still having 51% battery left once.. I only had the screen on for about one hour, atleast 3 hours of those I listened to music in the PowerAMP music player with a wireless bluetooth headset, equalizer enabled.. Auto sync enabled, so was 3G and obviously bluetooth.. The bluetooth headset died after a few hours of constantly listening to music, the battery on it wasn't full however, so I did plug the headphones into the 3.5mm jack for the last hour or so.. but I checked the battery settings and it was 51% after 9 hours and one minute since last time I plugged out the charger when it was fully charged!