I believe the newer ATI All-In-Wonder Radeon cards have component out, as a dongle.
You can also use a VGA-to-Component video transcoder box, like an Audio Authority 960 (I think that's the model) box. I have one, and it works. However, RPTVs tend to suck for use with a PC. Blurry text.
You will also need an application like PowerStrip to get the HDTV timings just right too...