I had 50% last night after almost 2 days of use w/o charging, and decided to watch a movie (40-year-old Virgin) and when the movie was done (after a couple of calls interrupted it that I ignored), there was around 35% of the battery left to my amazement.
For those that haven't seen it in action yet, when watching a movie and a call comes in, like music, it pauses the film, switches to phone view, and cuts back in when you hang up or ignore. Lovely feature.
Traveled earlier this week. I watched 1 full-length move, 1 ski movie (which was a little over an hour long), and an episode of Seinfeld. Basically the equivalent of 2 full-length movies. I also did a lot of surfing while sitting around airports. I still had half the battery left when I landed.
I was impressed.
Oh yeah... I had to answer the question "Is that an iPhone?" 3 times.