The best 404 not found… Why are you here? You may be here because my domain that is hosted by a company that puts ads on your 404 page by default. I know it’s terrible, but I guess they make a good chunk of change doing it. Anyway, here you are instead of that page.
Go forth and find the right one!
Or Look at how some other more creative people achieved 404 excellence:
a how to: http://www.conversationmarketing.com/2008/06/create-a-great-404-page.htm