It's funny, when I tried tanking on my death knight, I never really got the hang of it. I even outleveled an instance and just couldn't hack it. On my druid however, it just comes naturally. Granted, I have been doing it since level 40 or so. Anyway, I've had people add me to their friends list as a competent tank and it feels good. I want to push to 80 and tank some raids, yo. Anyway, I'm 74 now, I recently tanked Azjol Nerub and Ahn'kahet. It was pretty cake.
I hope I get as good at Healing.