#1 - Aug. 10, 2007, 5:28 p.m.
Sorry for the confusion, although it has a cast time, Slam will not proc Windfury.
The exact, correct and current wording of the hotfix is:
Q u o t e:
Windfury Totem will no longer trigger for any “yellow” attacks unless they are on next swing attacks, such as Heroic Strike and Cleave.
Slam does not take up the next swing of the attack, therefore it will not proc Windfury.
[Editted for inconsistent use of capital letters]