The Hulk rearranging the teutonic plates in Planet Hulk comes to mind...
... as well as when he held up the mountain in Secret Wars. That's a page/cover that's impossible to forget.
He trounced every X-Man/mutant that came his way in that recent three-parter when he confonted Xavier.. brilliantly-told story.
Hulk punchin' The Maestro in the nuts "sing soprano, loudmouth", or using Cap's shield to practically tear him in half was sweet also.
This is somewhat cheese, but I also liked how he embraced Caiera to keep her safe from the core breach. He kept her intact, but she was dead nonetheless.
F#ckin' Illuminati, killin' Hulk's woman.
