Since nobody else has posted here, I thought I'd add a little about what I've learned as a healer druid. I haven't really played other healers before, so this is more healer advice than druid advice.
-If you're getting attacked, run TO THE TANK. This goes for anybody. If you're running around like a chicken with its head cut off, they can't help you.
-Save up your mana for when you really need it. Put down HOTS until someone is about half health. This will help you.
-I've been told by many DPS people that healers shouldn't heal them. If they're doing their job right, they won't get attacked. The way I think about it though is heal the tank first, then you can think about the rest of the group.
-Battle rez is your friend, but don't use it on just any old fight. Remember that it has a long cooldown.
I hope that this can be of use to someone.
Mahima