I have an HTC Evo and love the hell out of it. I got some App killer, I think its called TasKiller. I just went into the market and searched for a free app killer. It seems to work fine, you just open it up and it shows you all of the apps that are running and allows you to close them individually. Although I don't really run too many apps at a time, and never play games on my phone. I do watch a lot of videos though, and my battery drains faster then I ever thought, especially when the 4G is on (so its normally off).