I found a post that shows a way to get the new Unibody MacBook to display on a TV using the mini display port to VGA adapter from Apple ($29) plus a second adapter for taking the VGA and turning it into s-video or composite ($39).

Here's the post. Please note, scroll down a little less than 1/2 way and look for a post with lots of pictures from a user named "Lougie".

This looks like it will work, and from the poster's comments about it and photos, it does indeed...but I don't think it's right to have to force users to buy a non-Apple converter to work with an Apple converter to get this done. Every previous versions of the MacBook and PowerBooks offered a cable for video out to s-video or composite....but why not the new 13" aluminum unibody MacBook? Spending $70 to output the occasional .avi file to my TV....vs converting and burning to DVD and accomplishing the same thing just doesn't seem right. 

Minus the $32 I spent to upgrade QuickTime so I have an .avi to .mp4 conerter, that leaves about $40....I could easily buy about 150 blank DVD-R disks for the $40...so to offset this, I'd basically have to watch more than 150 .avi movies to make the purchase of the above setup from Lougie worth the investment...otherwise, it just makes more financial sense to convert .avis to .mp4s in QuickTime then burn them to DVD with iDVD. Am I really going to watch more than 150 .avis in the next few years to make it worth it to buy the converter? I don't think so...I really don't.