I'd say holy is a fair tank healing spec as well though. Two of the most improved heals in the holy tree are Flash and Greater Heal. And, well, no need to even finish this sentence.
Also, has anybody else noticed the amount of spells seemed to have gone up an incredible amount? Pre-patch, I used to heal like this:
-PoM on the tank
-(Cancel)cast Greater Heal on the tank (depending on whether I'm doing a 5-man or raid)
-Keep renew up on the tank
-Shield, Flash Heal, or Greater Heal a DPS that takes damage, depending on what I've got time for
-Occassional Holy Nova if the entire group was stuck at ~95% hp.
I realize my respec to holy might make a difference, but post-patch I heal like this
-PoM on the tank
-Cast Greater Heal once the tank gets <60% hp (or cancelcast in raids)
-Keep renew up on the tank
-Shield, Flash Heal or Greater Heal a DPS that takes damage
-Holy Nova whenever everybody's at 90% hp or when there's a lot of mobs around
-Upon a Surge of Light proc (which usually comes after a Holy Nova)... Wait 'till anybody loses 30% hp then throw an instant Flash Heal.
-Use Circle of Healing on the tank when the whole group is between 80% and 95% HP and I'm too far away from the group for Holy Nova (or Holy Nova isn't worthwhile)
-Use Guardian Spirit when anybody gets dangerously low and I can't afford to stop healing the tank. Or, just throw it on a low HP DPS and furthermore ignore him.
-And use Desperate Prayer when I get <50% hp and can't afford to heal myself
And heck! I haven't even mentioned Lightwell yet, and aside from the free cast aspect, I barely use Holy Concentration since it procs after a crit; which is generally when I least need two quick heals. Thanks to all the procs, free heals, and sheer amount of healing abilities I've got, I'm actually having trouble finding a use for Guardian Spirit, Circle of Healing and Lightwell. I generally drop Lightwell on bosses, but I barely need it. Guardian Spirit is loads of fun for PvP, but I rarely need it in PvE. Circle of Healing is a very nice spell, but also one I rarely use.
I'm going to keep Holy Concentration just because I figure I'd really need the mana in a real raid (I had to give up Meditation to grab Guardian Spirit), but I'm actually getting ideas that involve dropping it.