So I have talked to a few fury warriors, and read a few posts on the official forums, and everyone says something different about the rotation. Sure, everyone is close, but if you listen to me (and you should), they've got it wrong.
This is really simple, people. The rotation is pretty much set in stone. Only a blue post or a spot in the bible would make it more legitimate. But for those not in the know, the fury rotation is:
Whirlwind -> Bloodthirst -> Slam on Bloodsurge Proc + Heroic Strike above 65 rage
Six to the fizzle.
Why? It's important to establish a threshold above the combined cost of Whirlwind and Bloodthirst to insure that, at any given time, you can use both of these abilities as they cooldown. You want to use them every time. Every. Time.
And I'm not kidding either. If you're HSing at 40 rage like a little monkey, and Whirlwind -and- Bloodthirst come off cooldown, then guess where that puts you. Unless your rage generation is ridiculous, you're gonna be twiddling your thumbs while you wait for Bloodthirst to light up. This is lost dps. This is also bad dps.
So 40 rage is out. The true combined cost of BT and WW is 55 rage. Throw on another 10 for human error, and you'll find yourself sitting pretty. At the very least, with my gear and spec, I'm sitting pretty.
Here's something I learned a long time ago, when I was first suiting up for Karazhan: Don't try to reinvent the wheel. Do what the successful people do. After all, they're up there for a reason.