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Notfound.org is a way for webmasters to make better use of their 404 error pages. Instead of displaying a standard message, the Notfound project wants you to install their program so a missing child's picture and details are automatically shown.
Currently, over 2000 websites have signed up.
A beautifully designed 404 page, bluedaniel.com gives its users an animated page of a train leaving track 404. Complete with sound and impressive graphics, this example shows what designers can do when they put their minds to it.