While I freely admit I am not a big fan of Hutton's work, there is a good interview with him posted at
http://druidnetwork.org/en/profiles/people/ronald_hutton.html#interview (from 2003, so a bit out of date). Mysticwicks (http://mysticwicks.com/showthread.php?t=93041) had a lengthy discussion regarding his work a couple of years ago.
You've probably also read Jani Farrell-Roberts' articles/correspondance from The Cauldron (http://www.sparks-of-light.org/Murray%20and%20the%20Professor.html) on the subject of Murray and Hutton.
My personal opinion is that Murray did the best she could given the limitations on travel during the period she wrote "Witch Cult" and "God of the Witches"; a period when she could not conduct the same level of field research she did with her Egyptian studies, and that far too many of her detractors selectively edit their own evidence as well, including Hutton.