I leave my gps on all the time.. Here's my battery use. As you can see, I was on the phone A LOT. lol
Nice....two days is pretty sweet use. I am 10 hours in and down to 50 percent. Wifi and Gps off all day, quite a few txt and some email, a few market downloads and playing toss the paper for about 30 minutes and watching a little youtube video.
In another thread I think stryguy says he experimented and realized that he had to leave gps off. It's kind of a tricky bug because if you don't have any apps/widgets that use gps, you can leave gps on but you won't experience the battery drain.