i have connected my macbook to my HDTV using the following cables:
HDMI Cable $0.23 (Amazon)
HDMI to DVI adapter $0.53 i think (Amazon)
Mini display port to DVI adapter $29 (Apple)
Belkin Audio Y cable splitter $5.04 (amazon)
These cables will hook up video and sound to your tv. The audio cable is needed because apple disabled sound in the mini display port for macbooks.