I've always been a fan of Subdecay. I own the Subdecay Blackstar and also it's lower-gain counterpart, the Liquid Sunshine. Both are excellent drives. They are simple, intuitive and most importantly, they sound superb.

Here are more Subdecay pedals in action. The Echobox, the Super Nova Drive and the Prometheus Filter. Now that's a lethal recipe for some beautiful noise! Controlled chaos, anyone?

Demo courtesy of they guys from Tonefactor.com!