This guy is doing it well - he is setting a nocache for Google so they dont keep a copy of the cloaked page - although its pretty easy to use firefox and set your UA to google and you can see it or use the link in the previous post - it shows the cloak page pretty easily and its a standard keyword spam cloak
as far as other sites - he has around 300 sites he's doing this to:
http://www.google.com/search?hl=en&l...-adultsite.com
which is actually small potatoes except that he's doing it alot better than most do