Here's an example how good the g-tablet (not samsung galaxy tab) battery is..
I took my family to San Jose, the drive was about 6-7 hrs...my kids watched 2 full movies, played some gba games using a wiimote, we video chatted with their grandparents, and they also watched a couple of spongebob episodes thru a website using flash...
At the end of the trip, I was still at 33% battery. The g-tablet was on the whole time, maybe an hour was stand by because my kids took a nap.
I think that's some heavy duty usage and great battery life.
Standby time, I can keep my tablet in sleep mode for about 1.5 days without charging. That's on a full charge.