How can I prevent unwanted pre-installed apps from automatically running on Android?

Possible Duplicate: How can I stop applications and services from running? As I can't uninstall certain programs that come with a phone (My case HTC Desire (not rooted)) how can I prevent certain apps from launching or trying to sync? And hide them? Or "Auto-Kill" kill them For example youtube app faceboook app stocks (including the sync feature) twitter (including the sync feature)
Category: Android

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