If you enter the instance portal while flying on your mount when you get inside you can swim through the air. I posted this over the the Exploration forums, but I'm sure someone in here can find some naughty things to do with this
You can land and run around like normal and when you jump you begin swimming/flying again. Lasts until you zone out /die.
Really cool if you want to play around with soloing bosses in Mists, get some practice in by just flying over all the trash!
It also serves as a nice aggro reset as most mobs drop aggro on you when you simply jump up.
Here's a sweet proof shot of me in Stonecore:
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