Google’s serious hijack problem
This is just another thing to be aware of if you suddenly find your site has disappeared from Google.
In a nut shell: Someone does an instant redirect to your site, Google thinks it is duplicate content and removes your site. Then the other person either slanders you or drives the content back to their site. This technique can also be used to steal your pagerank because Google thinks you have moved and therefore all of the links you have built up on your site should be awarded to this new site.