Freeze
Well, my optimism in the previous post has turned out to be completely unfounded. I got home from work and found the system locked solid.
Checking the system logs, I discovered that the USB devices disconnected 75 minutes after the computer booted up. There was nothing in the logs after that until the hard reboot I did when I came in.
I suppose the next thing to try is to get the latest version of NDIS wrapper, see if that stops the freezing at least. Another option is a PCI USB card.