So far we've killed the following bosses in Naxx...

Spider: Anub, Widow, Maex
Deathknight: Instructor
Necro: Noth
Abom: Patchwerk, Grobbuous, Gluth (most recent)

Gluth is basically Magmadar's surreal asshole cousin. He eats Zombie chow '

If I have to fight Patchwerk one more time I'm going to gouge my eyes out. Its like an epic encounter every week. Every time we kill him its like just as exciting as the first time ever.