I followed this guide
to get the 1.0.4496 drivers working. I'm running Debian testing, and didn't really have any trouble getting the necessary modules compiled. I made the necessary changes in XF86Config-4 (see attachment). My user is the video group. As it stands, when I try bringing up X, the nvidia splashscreen appears, followed by blackness. This repeats a little bit, and then it's all just black. I get the same behavior with the default options, with Option "NvAgp" "1" and with Option "NvAgp" "0". Relevant log output is attached. My hardware is rather old (TNT2 chipset), but it worked fine under 2.4.x and some older nvidia binary drivers, so I know the driver can power my hardware.
If there is any additional information I can provide you to help me, just ask. Thanks in advance!