1. Which version of the MacBook do you have?
2. What type of inputs does your TV have?
Depending on those two questions, you will have your answer.
Apple makes all sorts of adapters, but we can't say for sure which one you'd need without knowing some more information first.
My MacBook is the Blackbook from the previous release. About a year ago.
I have a 50" Sony SXRD rear projection LCD.
It has the following inputs:
Inputs and Outputs
Analog Audio Input(s) : 6 (1 Front/5 Rear)
Audio Out (Variable/Fixed) : 1 (Rear)
CableCARD Slot : 1 (Rear)
Component Video (Y/Pb/Pr ) Input(s) : 2 (Rear)
Composite Video Input(s) : 3 (1 Front/2 Rear)
Control-S Input(s) : 1 (Rear)
Control-S Output(s) : 1 (Rear)
i.LINK® Connection : 3 (1 Front/2 Rear)
Memory Stick® Media Slot : 1 (Front) - Memory Stick Duo, Memory Stick PRO Duo, Memory Stick PRO Media Compatibility
RF Connection Input(s) : 2 (Rear)
S-Video Input(s) : 3 (1 Front/2 Rear)
PC Audio Input(s) : 1 (Rear)
PC Video Input(s) : 1 (Rear)
HDMI Connection(s) : 2 (Rear) - 1 rear input included L/R audio inputs
Optical Audio Digital Output(s) : 1 (Rear) Dolby® Digital