PS. I'm curious if anybody is able to interpret the append? RK=0/RS=o
Apparently this is a problem caused by a (lazy? not very bright?) scraper who used Yahoo search results to scrape and just grabbed the URLs for their "Directories" from the results, as is without editing out Yahoo's internal link structure. There was some discussion about that around here. If you were to search here for "RK=0" you can find the entire answer.