Yes, an actual working iDVD/external burner hack

[Tom Spielman]

I first saw it mentioned on dealmac and then in the ManNN forums.  
Here's the link:

http://tinyurl.com/33ob9

Basically you download two small files and place them at the root of 
your home directory, then when you control-click on the burn button in 
iDVD you'll see your external burner listed as an option.  I have 
verified that at least that much works, but I haven't attempted a burn 
yet.  Others on dealmac have said it does work.

Note: Try at your own risk.  These two files could be trojans or 
viruses for all I know, but for me it was worth the risk.