I gotta say, at first I was really concerned about battery life, it was seeming to die within a few hours (maybe 5 or 6 hours of playing with it).
But I only have gmail and weather syncing now, I got rid of friendstream, facebook, twitter, and calendar widgets. Also, at someones suggestion, I turned ATK on to crazy autokill anytime the screen turns off. this ensures things are shutting down. However, what I'm thinking really made the difference is the Root + OverclockWidget method. I hardly go thru any battery during standby now. Yesterday with regular usage (some txting, browsing, some bluetooth phone calls) I was able to go from unplugging at 8am to plugging in before bed at 1030pm at about 8%. A full day of no-charging is all I'm ever looking for in a phone.