http://www.edge.org/discourse/landscape.html
the December 15 2003 issue of Edge has an interview with Leonard Susskind (many anecdotes about beginning of string theory) and a discussion including remarks by Lee Smolin and Paul Steinhardt
the above link is to the discussion including...
First, we find in the skeptics dictionary that the concept is not well defined.
http://skepdic.com/occam.html
Next, the concept predates modern physics and is no more valid than 12th century physics.
Consider Occam's original premise:
Clearly the credibility of this premise died with...