okay, I do have the nvidias working on my 2.4 kernel, in testing version, as well. Check out the very useful site (hopefully still) at http://games.luv.asn.au/lsd/nvidia-mini-howto.html for setting up the whole shebang...
As testing now comes with the new X stuff you shouldn't need to do the whole installing X part, but it's fun anyway ;) Just make sure you follow the whole thing, cuz not all of the important stuff is obvious in there if I am remembering. And a cool thing about nvidia, even though they aren't doing full debian ideology compatability, they do keep on releasing new drivers and docs. rick