At the moment, you can marvel at an extremely brazen case of a sham-pagerank on ebay.de. The site for sale did not get the PageRank by itself but by being classified as a yahoo.com synonym by Google (Google cache-version). For all of you who always wanted a PR10 site:
1. Register your domain and put a few links on it to get it into the index.
2. Redirect the DNS-server to yahoo.com
3. Wait for the next Google PR-update and voila, you’re done.