I was plagued with this same problem after upgrading to 10.04.
Machine is a Dell GX260 with an Intel Corporation 82845G/GL[Brookdale-G]/GE 
Chipset Integrated Graphics Device (rev 01)

Random crashes, always required an reboot to recover, got so bad I
stopped using the machine for a while.

Googled for a solution, got one which seems to fix it.

Open a terminal & enter the following:-

echo options i915 modeset=1 | sudo tee /etc/modprobe.d/i915-kms.conf

Reboot the box.
Now using the GX260 daily, no crashes since.

-- 
Xorg crash
https://bugs.launchpad.net/bugs/566324
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