CapableMetal: Sweet :) There's a link on the previous page (and the github readme now) to the google doc with some documentation and a dev log - if I knew you were setting it up I would've made sure you saw it.
sporv: The Core 2 Duo will be fine if slower (my i7-2600 runs at ~10% real time, and optical flow comb filtering bumps that down to 6%), once you adjust the Makefile. I've heard of AC3 mods reusing existing connectors, so it shouldn't be too hard to pull an unused one for RF.
S-Video isn't required on the capture card, just composite. In fact capture quality improved when I powered down the chroma DAC on the board. Tunerless cards probably have less interference and could work better - I actually have one but I use the Hauppauge since it's by far the easiest to get. The card you linked to earlier is the exact card, BTW.
It looks like the phase inversion trick forces the comb filter to go fully 3D. That works very well unless there's any movement. I'm using an OpenCV optical flow algorithm, but the implementation is not perfected yet.
(If either/all of you want edit access to itPM me your google account info. I'm also up for making a thread on fanres :) )