Every time I re-install my laptop with an updated Linux distribution I forget or get lazy about disabling this "feature." Sure enough, I end up losing a bunch of work that I hadn't saved. CTRL+BACKSPACE ... KABOOM! HUH? CRAP! CTRL+ALT+BACKSPACE!!!!! GRRRR!!!
If not for anyone else, this blog entry is a place where I will ever return to see how to disable this "feature" so I don't have to spend a few minutes in Google looking for it.
Add the following to /etc/X11/xorg.conf and restart X11 (yeah, you can use CTRL+ALT+BACKSPACE for the last time!):
Option "DontZap" "yes"