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This is happening on OS X 10.8 in both Chrome, Firefox, and Safari. There is currently nothing running on port 3000 so I cannot imagine it is related to the Rails project there. It seems to be system wide but I wiped the etc/hosts file and flushed the cache.

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Did you try http:// localhost:3000? – cutrightjm Jul 3 '13 at 14:59
Yes, I found the reason so I'll update in a second. – Aaron Jul 3 '13 at 15:03
up vote 1 down vote accepted

The culprit was Rack. Another developer had added rack middleware that did a 301 redirect for all domains to go to www.#{domain}

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