I didn't notice a change in my battery life after 2.2 but I've run task killer since day 1, I also shortened the lite screen time and turned off the vibrate on touch. Only time my phone doesn't make it a full work day is if I'm on it way too much. For the most part I'll have half battery life by night.
If its a heavy use day, the battery does get taxed pretty hard. Thankfully any Micro USB cable and a computer will work. No need to ask anyone for an itunes/ipad/iphone cable. =)~