Depends on what input you have on the TV.
Likely you'll want a Mini-DVI to HDMI cable, as well as something to port the sound.
The main apple store is a good place to start, but there are other places to get these cables as well
http://store.apple.com/ca/browse/hom...es?mco=NTMxNDY
Oooh, if you're looking at doing a bit of a media center setup, check out Boxee:
http://www.boxee.tv/
When I finally upgrade to a LCD TV, I'll definitely be setting something like this up.