shoreline - 1:33 pm on Mar 6, 2012 (gmt 0)
I noticed the exact same thing fred9989, glad you pointed it out!
Here's another interesting thing to try if your site has disappeared from the search results: if you have your results set to 10 per page, change the settings to 100 per page, then run the search again. In my case, the site that had "disappeared" from the results when showing 10 per page reappears in the same place it originally was, and remains there when I switch the results back to 10 per page. (Even when I am signed out of G with history turned off and cookies cleared...but using same ISP though.)