Its old news, this post was made over a year ago : http://www.davidnaylor.co.uk/buy-cheap-viagra-online-from-matt-cutts.html And apparently even the blog post above was old news :S
Yeah this is old, this happened awhile ago. Like the george bush incident where if you typed in miserable failure, his library or something came up first.
So much for google showing "related" search results. Matts blog is not even related to viagra, but it ranks high because it has so many backlinks.
Ranks #4 when I just search for that. Some of the search keywords have gotten very bad in the past week. I see lots of websites ranking #1 that have nothing but low quality spam links. (blog comments etc.)