TV-out is a very common feature on graphics cards now. Most commonly they have an S-Video mini-DIN socket, which can also be used as composite with a simple hardware adapter, usually provided, and a configuration option. The advantage of S-Video over RGB is that ready-made leads are far easier to find and usually included. Some cards have a phono composite video socket instead, which is much the same as far as drivers and software are concerned. I recommend using S-Video if your TV supports it, because the quality is visibly superior to composite.

There are two disadvantages of using this feature instead of RGB. The first is that most of the cards on the market now have rather poor quality TV-out. The second is that TV-out is an area that is neglected by the XFree86 developers, mostly leaving it up to third parties to provide extra drivers etc.