My site too has dropped 4-5 pages in nearly everything it ranked for .. even internal pages for various keywords .. I had held the top 5 spot for various keywords with hundreds of millions of SERP's and now find my site on the 5th or 6th page for both of them ... crazy! I went to bed at 3am (july10th) and woke up at 10am(july10th) and all of my rankings are pushed back 3-4-5 pages no matter what keyword I was ranking for .. For a result of 360 MILLION results I was #4 for the past several months and now find myself on page 6! Not sure what to think of all of this.