www.fick.us
People this is easy to do.
Google ranks pages with 301 redirect as the destination page's rank.
They simply did a cloaking redirect back to a Google page rank 10 page.
When the bot visits - it gets the PR10 page as a 301 redirect so the page has a PR10.
When a human visits - they are not redirected so you see the regular page.
This technique is USELESS for real search engine results because their page will never appear in the Google index. Try searching for any phrase on that page and you will not find it in Google.
It's also a great way to get yourself permanently banned from Google, including your server IP and nameservers. Highly NOT recommended.