[VIDEO]http://www.youtube.com/watch?v=e-fJ37vczf4&feature=related]‪Allan Holdsworth plays a DeLap double neck and 36 inch baritone‬‏ - YouTube[/VIDEO]
IIRC, this is the guitar that had one neck in standard tuning and one tuned FCGDAE.
That's really cool! It doesn't look as big as most doublenecks either so it might be easier to use. That FCGDAE tuning is pretty fun too. I had a guitar tuned that way for about a year, it was fairly easy to get to grips with scales on it but it the tuning really helped keep me out of the box that I'd get stuck in on a normal guitar.