One of my sites seems to have been affected also. But in my case, Google has dropped only the home page from the index, and kept the other 19 pages (it's a small site). Until a few days ago, I had excellent SERPs on my desired keywords, almost all pointing to the home page. Now that the home page has been dropped, the site's presence in Google dropped by about 95%. Can anyone think why they may have just dropped the home page? I would have thought the entire domain would go, but that's not the case. Could it be another issue in my case? BTW my site is squeaky clean, with original content. I have not knowingly engaged in any shady tricks.