It's possible that the s-vid port (since it's a 9 pin) does in fact support more than 480i/p/whatever. Many of their cards would seem to from the hdtv adapter faq on their site.
I was wondering the same thing but didn’t see anything but S-Video to Composite listed in the user guide. Couldn’t hurt to try it though.
Radeon X300 Series Users Guide for reference:
http://www.fujitsu-siemens.co.uk/rl/serv.../RadeonX300.pdf@ cameron
There appear to be so many cards that will do what you want it’s hard to make a recommendation without knowing what all uses you plan for it and what it’s foundation (motherboard and processor) is. Here’s a start just to let you know there are some relatively inexpensive solutions if you don’t want a bleeding edge card.
http://www.nvidia.com/object/buy_now_results.html?id=7600GSI’m sure ATI had as many selections if you are partial to them. Google just popped up Nvidia first.
