Have anybody checked this http://www.searchenginepeople.com/blog/has-uncoverthenetcom-been-penalized-by-google.html
There was a post about this a month or two ago in the directory forum if you search. Pretty sure it had something to do with the restructure of the category URL's.
Maybe the paid links goes so far with google, or it's a double content proxy hacking explicit, Only time will show what is going on with Google.