Google Caffeine here?
Looks as though Google may be rolling out their latest changes now, so keep a look out for how your site is being indexed, and how quickly. Caffeine seems to be aimed at stripping out spam sites from search results, but it is also showing some changes in indexing/SERPS re ‘old’ Google.
See more here: http://www.seoibiza.com/blog/2009/08/19/google-caffeine-observations/
