Maybe others already know this or figured this out. Apparently our phones work a lot like a Blackberry. On a Blackberry if you hit the home key or end key to exit an app it will stay running. Same thing happens here. However, if you hit the return key to exit the app it will stop running. I tested this out on my Incredible and it also works. I used Facebook and a couple other apps as examples. If I go in to the app and then leave the app by hitting the home key it stays as an Active backgrounded app. If I however use the return key to leave the app and return to my home screen then the app is listed as inactive cached. This could help a lot of people with battery life and sleep issues, but I'm not sure. I know the way Android works that background apps aren't supposed to really do anything. There does appear to be a difference though. This also works on the Engadget app which I've heard people mention for not closing.