DaveN has been laughing at Matt due to this update and his new blog. Basically, Dave reports that if you do a search on mattcutts you see a result, but when you do a search on mattcutts.com you get "Sorry, no information is available for the URL mattcutts.com.". That message is normally a sign of a major issue with a site in the Google index. Dave has screen captures if you need them.
At the WebmasterWorld thread, Dayo_UK posts this information on page 9.