Wiring a Computer to a Cable Box

Although it may fall more on the t.v. side, I thought this was too cool not to link...

--How to turn your computer monitor into an HDTV with one firewire cable

Incidentally, I've recently been doing the opposite, using my HDTV as a computer monitor (it has a DVI input). I've been able to download and watch hi def trailers, for example Iron Man's. They look great. Plus, I've been able to use Griffin's iMic to take sound from out of the computer into the ol' home stereo. Makes the Black Sabbath song at the end of the Iron Man trailer seriously foot stomping.