I took some unique text from my site did a search "unique text" and found this site "mysite.com.superservers.org/" using Google. Google has obviously been there, the page IS my site, and when you click around its all my site, gets errored out when you add to cart, but everything else is my site. To the T. I believe this may be a problem, in addition my home page is currently gone from the serps, and this site has a PR 0 (not grey) on the home page. All other pages are grey bared. So as a coincident, all my other pages have PR and cache, but my home page does not, I believe there is a direct correlation.
In addition they state that any site can add .superservers.org to the end of the url and be surfed that way.