What kind of video output port do you have? DVI? mini-DVI? mini-DP?
If you have a DVI port, then all you would need is a DVI>HDMI adapter plus an HDMI cable.
If you have a mini-DVI port, then you would need a mini-DVI to DVI adapter ($30 from Apple ... could be $20 now), plus the aformentioned items above. Alternatively, monoprice.com sells a mini-DVI>HDMI adapter for about $12. Then you would just need an HDMI cable.
If you have mini-DP, then you would need a mini-DP>DVI ($30 at Apple) plus DVI>HDMI adapter and HDMI cable. Or get the monoprice mini-DP>HDMI adapter and an HDMI cable.
In all three of these situations, you would need to bring audio in from a separate port. What you get depends on your TV. My TV has a set of ports for RCA audio for one HDMI port. So I got a mini-jack>RCA adapter and a set of RCA audio cables. Some TVs have a mini-jack port, so you'd need a mini-jack cable.
Some other types of connections for your TV would be DVI or VGA. On some TVs, using these ports is better due to overscan issues ... although I'll admit that most newer TVs handle overscan very well.