mack - 2:05 pm on Jun 30, 2010 (gmt 0)
Are different search terms. The first (without space) is a Google search operator to only look for sites that link to your page.
The 2nd search (with space) is a broken search string, but will still be handled by Google. What the 2nd search is doing is displaying pages that contain the term www.example.com it may be a link it may be simply text.