This is of very obscure interest, but I found it quite fascinating: If you accidentally type "http://" twice, like this: "http://http://www.thoughtsonthings.com/", then you are automatically sent to Microsoft's home page.

This is a fairly common typo when you're pluggin' in URLs, especially with generated page content, so I'll bet they manage to get a lot of traffic this way. What other major companies are scoring traffic this way?