So I was thinking about my own 2-healer team. Here's what I'm thinking about trying:

Tank: Blood Death Knight
DPS: 2x Elemental Shaman
Heals: 2x Holy Paladin

I've always loved Holy Paladins, and I'm thinking this team could be pretty hot! The main concept behind this will be each Paladin will Beacon of Light on each Shaman (yes, I know I'll lose out on Holy Power this way, but it shouldnt matter), so basically, each time a Paladin casts a heal its 2x heals on the tank, a heal on each Shaman and a heal on each Paladin. That combined with 2x Healing Stream totems should make this combo very survivable.

I was also going to throw in a Judgment, Holy Shock, Exorcism with each paladin when I can.

Thoughts?