I am going to make a new guild for Cataclysm raiding (as you can see in my signature). That means I will probably end up as a raid leader inside this guild, but I've never experienced any healer being raid leader before (been in 5 different guilds). I'm pretty sure it's posible, but is it efficient? I suppose so if there's many other guilds who does it.
Therefor I would like to know what your main raid leader's role is (tank, healer, melee, ranged)?