I found some software that approached the topic of playing fast in a structured way and can say honestly that it helped me in all my playing. It starts off by profiling your playing, so that you tailor the course to work on your areas of weakness.

My bluegrass, rock, blues, pentatonic and chromatic stuff has all become more streamlined, by working through the whole program.

Guitar Speed Trainer

The program will even get you playing Flight of the Bumblebee along with John Petrucci.