This is Jon Patton's adaption of the Tube Driver, but it uses a JFET insted of a tube. It also has a few extra goodies thrown in such as an 18v chargepump and a mids switch. This circuit sounds very good IMO and has excellent controls and a wide range of tones. Thanks to Jon for sharing his work!

Edit 2015-06-12. Layout updated and verified.

Here is a great sounding silicon fuzz made by Davide Gironi.
Original thread here.