I noticed this today too. It's like BT is the battery killer. I've never had to charge my touch more than twice a week, but since using the BT I've had to charge it two days in a row!
And everything people have said up until now I can confirm:
-Thought it worked with my BT dongle, the Touch will not natively support the forward and back controls on my headset.
-Having the screen locked when you aren't using the screen will conserve much of your battery. I think this is because it shuts off discovery mode, which is indeed the reason the battery leaks like a dutch loche.
Hopefully Apple will release a fix for the above when the push the next update. I'm very happy that the Touch got native BT support though. I can sell my dongle, and aesthetics matter to me, so now I look even cooler, lol!