I was using my phone a lot yesterday, being I only got it Monday, and I was trying out different browsers, showing a 720p video to a number of people, checking mail, messing with Maps, and posting on a number of forums. The device was on since 8am or so and right before going to bed at around 11:30pm - 12 the device had just drained down enough to power off and not turn back on until I plugged it in. At about 11pm or so it was at I believe 6% battery life. To me this is excellent and extremely impressive - because I simply never use the device that much in a day. Of course a new device is going to require a lot of setup time and tweaking and all that so the amount of usage I gave it is way beyond a typical day for me. This was also with only 2 charge cycles if I recall. And if I ever did go nuts with my usage I have chargers at work and home so no biggie, plus the battery is removable so I could always get a spare or two for watching videos on long flights and such while on trips.
Rev.