Warrior tanking is much nicer post 3.0, but it's still not as easy as Pally tanking.

I loaded up Omen and was watching the threat generation on my warrior and pally tanks on different HH farming runs for my alts. My pally easily outpaced both my mages (one fire, one ice for testing) and my ele shaman.

One trick I have been doing on the warrior to boost threat is to place vigilance on the fastest threat generator on the group. I started with it on the healer and my mages caught up, I put it on the highest threat mage and they never caught the warrior on threat. You can play around with the spell, no cool down and zero cost, so if a fight is heavy on healing you can swap it to your healer. I have not used it in raid yet, but if I was a back up tankI might put it on the main tank to keep high on the threat list and reduce the damage on the MT.

Tool tip on vigilance:
Focus your protective gaze on a group or raid target, reducing their damage taken by 3% and transfers 10% of the threat they cause to you. In addition, each time they are hit by an attack your Taunt cooldown is refreshed. Lasts 30 min. This effect can only be on one target at a time.

Stomp all the time, shockwave all the time, and AE tanking is a lot easier than it was before 3.0 on the warrior tanks. Also you can set up a mouse over sunder macro, I have not played with it post 3.0, but I used to load up sunders on CC'd mobs since sunder did not break CC.