with this exploit you will be able to get WF as every class.
Exploit Requires:
Shaman that have learned Windfury Weapon,
BlackSmithing hammer.
How to do it:
1. open a trade window with the shaman
2. shaman equips blacksmithing hammer in main hand.
3.you drag your weapon to "will not be traded.
4. shaman clicks the wf spell and then your weapon in the trade window.
now you have windfury on your weapon enjoy