Weird because since ive upgraded to 2.1, my Battery lasts a day and a half, when earlier it used to last only a day. (2.0/2.0.1/2.0.2)

Same amount of usage, etc.

But I have still bought a More-Thing Emergency Battery Pack which works great!. It manages to charge my iPhone 3G from 20% to 100% on one of its charge. I carry it around when I go to work, since im really lazy to bend down and plug the Apple cable into my workstation .

Other than that, Signal strength is better. Not a lot, but I rarely loose signal, even while traveling in the train here. Usually id loose it about 10-12 times in 1 trip, but now I barely loose it 3-4 times.