i have only been using linux for a few months, but i figured i'd respond since i have the same video card. i did not have any problems on install. i had a couple issues when i updated my kernel and driver. in the end, i used:
yum install nvidia-glx kernel-module-nvidia-$(uname -r)
it sounds like that is what you did, but i figure i'd throw that out there. out of curiosity, did it detect your monitor correctly? i've installed fedora 4 on 2 computers (1 with amd and one with a p4) with a 6600 and i didn't have trouble on either with the above command.
...i googled your monitor and it looks like they added support for it back in f3 (last may). i'm interested to hear what fixed this when you find out.
https://bugzilla.redhat.com/bugzilla....cgi?id=157055