These are the reviews available online for free, as of June 2007. There have been a fair number of reviews that are no longer accessible online.
Austin Cline, About.com, 2007.
Evelyn Sears, March 2007.
Anthony Campbell, March 2007.
Wolf Roder, Fig Leaves, February 2006. (on page 11.)
Jan Willem Nienhuys, Skepter, November 2004.
Paul R. Gross, e-Skeptic, October 2004.