I was just wondering if anyone had seen or heard anything about 'Google Proxy Hacking'.
If you have a popular, high PR, well ranked site in Google that suddenly disappears from the search results and drops to a PR 0, then this may be happening to you. Check out this article on the subject:
http://www.seofaststart.com/blog/google-proxy-hacking
I would like to hear other opinions on this...