For all of those using Xscreensaver for locking your desktop, by pressing ctrl+alt+backspace the X server will quit leaving you in the console from which X was started, logged in as the user who started X. Now this can be easily solved by editing XF86Config file and disabling ctrl+alt+backspace combination.
Just a "bug" i found yesterday that could be useful for some of you if you use XscreenSaver to lock your desktop.
Hope it helps someone
-NSKL