Holy pallies:

[capnpop]

Interesting specs:

Prot/holy (non-pvp) - Note: this will be nerfed substantially come 3.2.2
There is a pvp variation of this spec but I'm not familiar with it enough to speak with authority regarding it.

Holy/Prot (utility) - Some of the reading I've done indicates that this is one of the best specs for hardmode/progression healing due to mana efficiency while using the "proper" glyphs.  (Glyph of Beacon of Light, Glyph of Holy Light, Glyph of Seal of Wisdom)  Gives 50% more up-time to beacon + 100% more up-time on a single cast of SS and more absorption.

"Standard" Holy/ret - This is the spec I use for my healing as of right now.  Easy to use and it is fairly well-rounded (Glyph of Holy Light, Glyph of Flash of Light, Glyph of Seal of Light) to handle most small and large-healing jobs.

Tonight I'll be trying the Holy/Prot spec I posted and I'll let you know how good/bad it is.  Should be interesting...