There have been a lot of TV-on-OSX threads, but I haven't seen anything about support for TV input on the Powermac 75/76/85/8600 with the PlanB video chipset. It turns out that these macs have Linux drivers for video input. Those drivers are based on the Linux Bt8xx drivers, which have been ported to OSX. What I want to know is has anyone put 2 and 2 together? PlanB support on OSX would kick ass - watching TV is the only thing that my trusty 7600 can't do under OSX that it used to do under 9.
PlanB drivers for Linux:
http://www.cpu.lu/~mlan/planb.html
Bt8xx drivers for OS X:
http://sourceforge.net/projects/xtv/