Same sort of thing happened to me. This time it happened when I left it
running while I went away for a few mins and it had crashed by the time
I came back.
** Attachment added: Ubuntu Edgy with Radeon X300 - Crash when idle
http://librarian.launchpad.net/5355500/_usr_bin_Xgl.1000.crash
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I'll try to remember. It's been a while. From what I remember it turned out
that the ubuntu 3D screensavers were still switched on and caused the crash
every time I left the computer long enough for them to activate. I was using
the opensource ati driver. I used XGL because when I tried AIGLX it
