nvidia geforce2 MX is running ok here in 6.5.00 with the nvidia's legacy driver. Wasn't aware ubuntu was having a problem with the older cards. Installing the legacy nvidia driver in Mepis is really painless, basically brain-dead really.
I did run into some problems with the monitor being incorrectly identified. All is fine now. Really no better way to find out than trying it. Don't forget to try pressing f3 at the grub screen if resolution is a problem.
btw, Beryl is running just fine here, and is more useful than expected. Fun too.
edit/ Looks like not is well in geforce2 land after all
http://mepislovers.org/forums/showthread.php?p=47215
Haven't noticed this problem so far on my machine.