Noticed it some time ago that like in ubuntu (since 9.04), debian doesn't restart the x-server if you hit ctrl + alt + backspace anymore.
It was deactivated in the X-Server some time ago because people thought it was pushed to often accidently, especially by former windows users. I think I never pushed it accidently, but well, as long as it is easy reactivateable it is no problem.
On ubuntu this could be fixed by installing dontzap via apt-get/apitude or synaptic and running "dontzap --disable". I only tried that since I remembered it, but it
didn't work in debian because the package didn't exist. I didn't look into it anymore, but today I accidently found an option while klicking through the keyboard-settings which
reactivates it under debian squeeze:
Preferences -> System -> Keyboard -> Layouts (Tab) -> "Layout Options" (Button bottom right) -> "Key sequence to kill the X Server" -> "Control + Alt + Backspace".
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