So the Cenarian Circle guy in org has no reset and can be kited as far as you like. This may not seem like a big deal to most but for me I rather enjoyed being able to kite something long distance again.
I kited him from org to Xroads and then to taneris.
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I haven't tried just any mob in a long while but a friend of mine and I tried to kite one of the world dragons but they have a leash you cant pass even if you are kiting. Not sure if they added that to all mobs or just them, so it might be worth looking into. Also one time when I went up to Ironforge Airport there was a mob up there that would never unaggro, just like in an instance. He'd follow you forever, not sure if hes still up there or not.
Use any rank 1 skill (so you dont kill the mob and if you have a slowing effect or a speed increase effect all the better) Basically ever 4 seconds refresh your dot or use your skill again as a mage I use rank 1 frostbolt until the mob gets to 50% then i poly them to get their HP back. Hunters can use aspect of the cheetah and mix distracting shot and concussive.
might try this out 
