I remap my Caps lock key on all my systems. Caps lock is a pretty useless key that’s sadly situated on the home row, the keyboard row where you naturally rest your hands while touch typing.
Having such a useless key on a such a prime piece of keyboard real estate is a waste.
There are popular alternative mappings, the Ctrl key being one of them. I myself prefer remapping Caps lock to another Escape key. I’m a Vim user and pressing Escape to exit insert mode is really a strectch.
Having recently installed Debian wheezy and Crunch Bang (#!) on two machines I found out that in Debian there is a keyboard file in /etc/default/ (/etc/default/keyboard) where you can set those options. No need to create a file and edit your .bashrc.
Here’s how you would remap Caps lock to act as another Escape:
grep "caps:" /usr/share/X11/xkb/rules/base.lst
Will allow you to list other possible options (Control, Backspace, etc.). If you don’t have access to /etc/default/keyboard you can always use xmodmap.
Note that you will have to use dpkg-reconfigure or reboot for the changes to take effect.