Two great gain pedals, one a tubescreamer (overdrive), the other a distortion pedal based on the ProCo RAT. Both work very well with tube amps, and have a very organic, dynamic sound. They are both made by Bob at http://www.duhvoodooman.com - contact him through his website for pricing and more juicy details about all the features and functionality enhancements his pedal designs offer.

I used a Suhr Classic and a Hagstrom Swede for this demo. Amp was a Marshall JVM410H on the Clean channel, Green mode. I recorded with an Sm57 into a GAP-73 mic pre, into an Apogee Duet. A little bit of reverb was added in Logic Express.