The Petitjean magic tool has been out for some time now and you will find it on the bench of many tyers. I have one myself and do use it on occasion to combine colors of marabou, CDC and to mix dubbing in with feathers easily. Marc put out a DVD to help explain the use of his tool when the product was released, and here is one of the flies from the DVD. All you need is the tool and 3 colors of CDC feathers to create a simple, effective and extremely quick tie.
The video is the Magic Head in action and the interview is VIA flyangler from the 2007 Western Canadian Fly Fishing Exposition in Calgary.