I have to hand it to the developers, they are really being creative with the bosses in Ulduar. Not only do you fight Kologarn, you also fight each of his arms. Kyth's take on the fight is at http://www.stratfu.com/strats/Kologarn.
As far as practice bosses go, I'd say bosses where you have to avoid stuff, like the OS trash and the library event in Halls of Stone, and bosses where members are incapacitated and you have to kill stuff to free them, like Maxxena, the Prince in OK, and the first bosses in Utgarde Pinnacle and Utgarde Keep, would be good practice.
3 years ago