I've used the ATrpms provided packages.
I have not used the ATrpms packages - I would recommend trying the ones from livna.org, since they're known to work.
Anyway, X still crashes when I run glxinfo.
Do you see any error messages? Anything in /var/log/*Xorg* that looks bad?
You should also run /sbin/lsmod to check whether the nvidia driver is loaded in the kernel.