Screenshot Hacks for Mac OS X
Subject:   ctrl & space
Date:   2003-03-01 02:52:46
From:   anonymous2
The built in command keys are just an interface into the screencapture command line tool - or vice versa ;-)

Therefore the ctrl key and the space key also work with the cmd-shift-4 combo. Hit cmd-shift-4 then space toggles. If you want to route to the clipboard hold ctrl when you release the mouse after dragging or clicking.