tedster - 3:00 pm on May 3, 2009 (gmt 0)
Across a large sample of keywords, the churn recently seems to be at a low level -- it's too low for a major algo tweak. IMO. If anyone is just watching traffic levels and wondering why traffic dropped, I strongly suggest watching at a more specific level - the individual keywords that bring your site Google Search visitors. When you only monitor total traffic, or even rankings as seen from your computer, you don't have enough information to take action.