So far we're hearing that most guilds are slowly working their way through Zul'Aman-- while some guilds waltzed in and took over the place, others have had a few bumps in the road, but if you've taken down Karazhan, progression seems to follow about as easily as Blizzard expected.
The toughest part so far seems to come right before what most guilds traditionally take on as the second boss-- Akil'zon, the Eagle god. We ran through boss strategy the other day in our Zul'Aman guide, but the problems people are having are coming from the trash mobs before the encounter-- there's a Suppression Room/Gauntlet type of run that some players are having a hard time with.
So far, the strategy seems to be, first of all, to keep moving. Just like in the other gaunlet areas (the aforementioned Suppression Room, the Lyceum, and the Shattered Halls gaunlet), slowing down will get you mobbed to death. Two tanks seems to work well (one to take elites, the others to take Warriors), and a Paladin tank will not only keep mobs off of clothies, but help out with AoE as well. Keep the group together, get those eagles down first and then focus on the other targets together, and it should be a piece of cake.
Have any other good suggestions for people trying to make it through the gauntlet in Zul'Aman?