I'm having the same issue. Welcome to the world of Froyo where task killers don't work. If you check other threads you'll see that task killers don't work in Froyo. The only way to stop apps is now to do a Force Close from the applications menu in settings. Even doing a force close (not using a Task Killer) you will see that some apps start running again. It appears this is just a symptom of froyo. Before i got the update I used to only use Touchdown when needed because i felt there was a substantial battery drain if i kept it running all the time (polling at 30 min intervals). I used System Panel to kill the task anytime i accessed Touchdown, but now it appears Touchdown and many apps start running again even after a force close. From what I read there's no fix in sight. Damn froyo!!!!