This Nvidia 9400 GT v1.1 (PCI 10de:065b) thing they gave me at the office works OK since I put in the new Xorg nv driver (drv_nv.so), version 2.1.14, just released this week. (Thanks Aaron!) I had to build from source, which is much easier than it once was (thank you, somebody); not quite "apt-get source xserver-xorg-video-nv; dpkg-buildpackage -b", but close. Now my GL programs run uselessly slowly, but I assume the 600MB/s load on my main-memory bus is gone, and I'm driving the monitor with HDMI instead of analog. It's really astonishing how little difference that last makes.
Why is it that when I resume Epiphany-browser after a crash (which most typically is because somebody used it to look at Ebay), it makes all the windows full-screen? That had been fixed for a while, and now it's back again.
And, why does running lspci in a regular user account make my Debian Sid laptop unable to fork new processes, or, maybe, unable to read the disk?