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Open up your browser and visit http://www.hexxie.com. You can also go to anything.hexxie.com and everything.hexxie.com, which will resolve to your local machine (assuming it's localhost at 127.0.0.1).
To set up your own just configure DNS to point your domain to 127.0.0.1 for the IP address. No more futzing with /etc/hosts
Originally got this tip from http://tbaggery.com/2010/03/04/smack-a-ho-st.html who has created his own service at smackaho.st
The word "Hexe" is German for "Witch". I have a dog named "Hexxie" after the German word and that is the origin of the domain name hexxie.com, in case you're wondering.