backdraft7 - 3:10 am on Feb 20, 2011 (gmt 0)
The way I see it, the serps are becoming less static. They now appear to be more fluid, perhaps based upon the users previous site visits (mood?). This makes a challenging moving target for SEO endeavors. The best you might be able to say is, I'm in the #1 position...most of the time. We knew this was coming. Didn't we?
btw - tonight the fluid part may be due to single malt scotch ;^?