Are you talking about using the round plug (S-video) or the trapezoidal plug with 3 rows of 5 pins (
VGA plug)?
I've plugged in my desktop computer to a 37" Sony
LCD with a
VGA plug and it works well. The key to success is having a video output resolution from the laptop that works well for the TV. If you have a video card that puts out a reasonable resolution, it may be too fine for the laptop, but good on the TV. Lower laptop resolutions will look pretty fuzzy when blown up for larger screens.
You can either mirror the laptop screen to the TV or set up the TV as a second monitor. While the mirror is easiest, if you want different resolutions, the second monitor gives you more flexibility.
The other thing to think about is sound. The S-video and
VGA plugs will give you video connections, but you'll probably want to get a stereo mini-plug to RCA plug adapter to run sound to your TV or stereo.