I work in an office from 8:30-5:30 monday-friday, so I have wifi available to me during those hours as well as wifi at home. I know that the wifi radio shouldnt be kept on when you arent connected to a wifi signal. However, is it better for battery life to use wifi as much as possible when it is available to you? My question in my case is this: Is it better for my battery life if I stay connected to wifi while at my office and at home instead of using the 3g service? Also, is there a program that shuts off my wifi radio automatically when certain designated wifi signals are not available? I use Juice Defender but am not too advanced in its features.