I just inherited a digital front projector, so I have officially begun the downward spiral into the wonderful abyss that is Home Theater. After reading, and reading, and reading, I've come to the conclusion that I need a HTPC to feed video to the projector. But how does the PC go about scaling a non-digital signal like that of a composite cable box or VCR input? Or an S-video DVD input? And how does that get to the projector? I don't mean literally how does it do it - I believe it works - I just don't know the logistics of how it will function. Will I have to run some sort of program from the Windows desktop before watching a particular source? Something akin to watching a DVD on the computer where you kick off WinDVD or some other program using a mouse and then put it to full screen and kick back to watch it? Also, how do I get all of those different video sources into the computer? Do the "video input" cards have a number of different source connections like multiple composite and S-video inputs? If not, how do I get multiple inputs in? I already have a test machine built but am waiting to understand a little more about the way this all plays out before finalizing and purchasing the last few hardware pieces, i.e. video cards. Thanks to everybody, in advance, for any input and/or recommendations!