Yes, it's more than annoying. So I'm back on the OpenSource Driver from XFree.
I knew the prob long time, so I don't loose so many things when it freezes :-), but I haven't got second machine here to shutdown via ssh cleanly.
AMD K6-2 500MHz
256 MB SDRAM
GeForce 2 MX 32MB
SuSE 8.1, mostly selfcompiled 2.4.19-4GB