Personally I press Ctrl
The power button.
I stomp on my usb foot pedal
Uuu, nice. Always wanted one of those. What do you use yours for?
I use mine for Star Power in Clone Hero (Guitar Hero-ish game)
Way back in the day I always wanted one to use as my push to talk key for Ventrilo… But these days with noise reduction algorithms, boom mics with cardioid sensitivity spaces, and adjustable activation threshold, I just leave my mic on auto activate.
I should probably find something else to use it for…
To wake the computer up from sleep.
Space key. That way it won’t accidentally enter an actual letter or command that could be passed to the current active application.
That’s not really much of a problem anymore these days (serious issue in WinXP era), but it’s still the safe key, so I use it.
Edit: I totally botched this. I meant Shift key. Derp.
Space bar is “accept” in many interfaces. If the screen was off but not locked, and a dialog box was focused, hitting space will submit that in some OS.
Control, on the other hand, won’t.