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Yeah, I use the shutdown command if I am watching a move in bed in case I fall asleep. Windows->Run-> shutdown -s -t 3600 shuts the PC down after an hour. :)

That's a pretty good idea. :)

Windows Key + Tab (iirc): Does that cool windows switching thing in Vista.

Ctrl + a: Select all -- this is really useful. :)

Windows:
Ctrl+Shift+Esc: Opens the Task Manager straight away

Lots of programs:
Ctrl+P: Print