Close, but not quite for the HTC Hero running Android 1.5. When you download "cow bouncer" or "JTR Android", you get warned that the application can "Prevent the phone from sleeping", and have to say OK or Cancel to the "install anyway" prompt.
There's no in-built UI for catching bad apps, but there are third party applications in the Market that use the existing API to tell you which applications are using power - they're spotted not because they're CPU hogs, but because they're holding a wakelock preventing the phone from sleeping.
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