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There is no need to worry about that apps that seem to be running.
Android is designed to keep your most recent activities "near by" so that if you return to them, they'll be there fast.
When you open a new activity, the previous one is paused and should consume no resources (except some memory), and this should not impact your battery.
This design improves the user experience (speed), but I think Google has done a poor job of describing it to the general public. Most of us have PC backgrounds, and we think of something that is "still loaded" as still consuming CPU and power.
Scott.
I was running the app killer program for a few days when I first got the phone. It was a PITA and I had read enough comments saying that it wasnt nessessary. I uninstalled it about 2 weeks ago and my Droid is running fast and the battery life is actually very good