Some preliminary observations. I can get less than 1%/hr drain on idle if the phone goes into deep sleep (as seen in CPU Spy app). I'm at 1d 8h since last charge, and have 47% left. I would've had more if some mysterious bug didn't appear where going into airplane mode prevented it from going into deep sleep last night (stayed at 245 Mhz) for 8 hrs, draining about 28%.
Handy apps to improve battery usage are BetterBatteryStats, CPU Spy, & Current Widget (to get current readings, although seems to be only updated every 60 seconds).