tedster - 7:20 am on Sep 22, 2012 (gmt 0)

This new way of showing the results - with my site being listed as a "similar search" result - is puzzling to me.

I have never seen that exact pattern, and yes - it is very puzzling. It's almost as if there is a "semantic subtraction penalty" in place (excuse my newly invented label here) that lowers the influence of a particular word, even though that word is quite prevalent and relevant to your page.