It dawned on me that it might be a good idea for those of us researching particular lenses to provide links to some of the useful information we've found. Here are links to some excellent review information for those considering this lens:
http://www.photozone.de …non_70300_456is/index.htm
http://www.pbase.com/fstopjojo/70300is
http://www.fredmiranda.com …=294&sort=7&cat=27&page=2
http://www.photo.net …anon/70-300is/review.html
http://www.the-digital-picture.com …6-IS-USM-Lens-Review.aspx
I had almost decided on the 70-200 f/4, but I must admit that I'm now having second thoughts and wondering if the 70-300 IS would be a smarter buy.