I know its typical to post problems in a forum, but I for one have always had pretty good sucess with the FreeBSD Drivers. Currently I use a Dell Percision 670 running FreeBSD 5.3
So far I everything works great with the Geforce Quadro1300FX PCI-e 16x card. I can even run the doom3 demo with acceptable framerates.
I just wanted to post an encouraging word on the Drivers for others. I've used almost everything from a tnt2 to a Quardo with both Drivers rev's and the FreeBSD 5.x branch. Please keep up the good work