For many this may be old school. I'm just getting into the whole HTPC now, so this is nice info to have on hand. The actual article can be found at htpcnews.com, within the guide section which discusses setting up Zoomplayer/TheaterTek along with ffdshow.
I just used the same settings as indicated and I can't beleive the results...very happy indeed.
http://xlobbystuff.googlepages.com/ffdshow_setup.pdf