One of the most recognized pages online Expires:

page not found

One of the most recognized terms on the internet “Page Not Found” also known as HTTP 404 error has expired.  Registered since 1999, the domain name expired on February 24, 2010.  Though the keywords “Page Not Found” get a fairly low search volume (less than 1,500 searches locally) traffic to the URL averages nearly 1,000 unique visitors per month.

It might be difficult monetizing a domain name like this, but nonetheless, it’s attracting bids at NameJet. 24 bids already at the time of this story. The domain goes to auction April 1, 2010. 

Another domain name with the keyword “page” in its URL sold in 2009 for $50,000 on Afternic.  Ironically though, it averages about the same amount of traffic as the traffic to despite the $50,000 price tag.