Ok so my video card supports s-video.. but my question is what can I actually do with this.. if my tv also supports it?.. Anything really special about it?.
You can connect your video card to your TV with an S-video cable. An S-video cable is a much better connnection that the standard "yellow" video cable.
It has a few uses, but using it as an actual monitor is not one of them (unless you like blurry text). Its good for watching videos, playing emulators, etc.
If you hook your computer to a TV through S-video, you can play games on it or watch movies. But, as the previous poster said, it's not for normal computing... text looks like crap on a television.