Okay, got the capture card working again. One of these days I guess I should figure out what's changed between the 2.6.11 and 2.6.12 kernels that's messing up. I've tried copying the .config over any number of times, so I'm guessing something changed in the code that either requires a new setting/option/module, or something was simply outright broken between the versions.

I guess I could try installing the video card now, but I'm expecting it to be a bit of a PITA. The documentation seems to say it's straightforward, and we all known how scary that is.