Since it crashes even without 3d sometimes, the problem does not seem to be related to dri (as in, dri driver).
Stable as rock, _if_ Load "dri" is commented out from xorg.conf (or from XF86Config-4)
Well, commenting that out makes the 2d ddx driver not to use the CP, drm etc.
Almost sounds like a hardware issue to me, very few people have problems when only using 2d (dri loaded or not) with the radeon driver (as far as I can tell). You could try using pci gart instead of agp, if there's a problem with your agp bridge (not sure if that would help though in that case), Option "BusType" "PCI" (old xorg versions might not understand that option however, they might have a boolean "ForcePCIMode" option instead).
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