backdraft7 - 1:17 pm on Sep 21, 2010 (gmt 0)
@squash - are you sure there was no "news event" that might have prompted the inrush of traffic?
I find that the Google Trends tool can be quite telling...and I just discovered that one of my main two word key phrases seems to be on a major decline.
In addition I found that Google has added this useless "News for (keyword)" display to the top of the Web search page. If I want "News" I'll click the News link. The result of this is that my #1 position for a prominent 4 letter, single word keyword has pushed me down at least 5 positions, nearly beyond the fold.
This "News for (keyword)" display appears to be directly tuned into Twitter...as every few seconds it updates with tweets containing my target keyword.
Google Trends also shows that my sweet 4 letter one word keyword has also taken a deep six in the past few weeks. The bottom line is that much of the changes we are seeing might be the result of Google's adding stuff to push us off the page and promote Twitter and other social sites.