For more information about Ken Perlman visit his website. You can find it (and many others) on my
Links Page.
P.S. My favorite feature in this "Progressive Clawhammer" section, and the one that I feel is the most important, is a survey that I had each of the featured artists fill out. It contains all sorts of information about banjo styles, technique, instrument setup, and anything else I could think of that might be of interest to banjoists.
Here's a link to the questionnaire: Clawhammer Illuminations: insightful answers to banjo related questions provided by Perlman, Johnson, Balch, Miles, and Iverson.