For a cat build this works well
http://www.wowhead.com/?talent=MzLV0oZEMMccbdty
focusing entirely on using Pounce // Shred(I think that's the backstab one). Get a shit ton of agility armor for lvling, but stash some int armor in the bank for when you have to heal or when you respec @ 60
Also, I heard of some success with bear form lvling. Make sure thorns is on, and moonfire 2 mobs. Use bear form's regular attacks on one mob, blow all your rage on the second mob who should be around 60-70% health from moonfire/thorns damage.
Also, for anyone rolling druid, I found a 'sploit (YAY). When you have to go around curing those deer/gazelle, immediately after you cure them toss a moonfire on them, when they die it counts it as another cured deer for some reason