I remember a few months ago i had an application installed on my bb curve 8330 that locks my bb keys after the screen blacks out.
I have seen AutoLock, but don't think it's the app i had.
After my screen turns off (after 30 secs) this specific app flashes a message (after 3 secs per my setting) that the bb will now lock.
The blackberry then locks, and doesn't turn back on when any key is pressed except for the mute key. So it doesn't put my bb into "lock" mode where i have to unlock it with the combo * and phone button.