I run a Shaman as my healer. When I was healing with a priest there were times where I'd look up and she'd be dead before I knew she had been hit. With my Shaman, he can be getting beat on by several mobs and between his grounding totems and his armor, my pally can run back and steal aggro off of him.

Tanking? I love my pally, but after reading what everyone is saying about DK's, I've been thinking about starting one and seeing their tanking ability for myself.