I know for a fact that something is broken in either xenocara or the main system, I can reproduce a kernel panic by running xfce, I've enountered it many times. But I don't know how to trap it before it faults in order to see what is going on.
My solution was just to ignore it and run cwm but I want to try to fix it. I don't know how though. -- Google doesn't need to know every time I fart.