I get a about 36hrs on my battery. I have found that the Market itself is a huge battery drain on my phone. I use my phone for Facebook, texting, talking, reading, news, weather and reminders alerts. Gaming will drain a battery fairly quickly. I use to have lots of games apps now I have Yahtzee and Sudoku and that's it. The most used app is my ereader app to read my books before bed. I never turn 3G off and I seldom use WiFi.
I do have Quick Settings app I use it mostly for a flashlight.