I wrote an article all about how to do this as well.
http://www.pwnda.com/2013/02/24/world-of-warcraft-leveling-80-85-in-one-hour-the-facts/

Level through Cataclysm in 1 hour!

This trick is still working as of patch 5.1.

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Maybe we can play sometime.
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Another leveling guide, a couple of you guys asked for this so luckily I had recorded this a few days ago since the servers went down all night!

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