Well for me it's quite obvious to have Caps Lock remapped to Control for 2 reasons. I'm used to Amiga keyboard, and now I use OS X on my primary workstation which requires Cmd / Meta keys which Model M doesn't have so I had to remap Alt to Cmd, Ctrl to Option (alt), and Caps Lock to Control. It feels great now. Also I use Ctrl only for terminal and text editing - old school shortcuts like Ctrl+A to go back to beginning, Ctrl+W to delete (well cut technically) previous word, Ctrl+K to delete everything to the end of line, etc. Very useful extension to what you already have in the system. Works on most Unixes and Unix likes.