I am currently healing holy with the following glyphs:
Glyph of Flash Heal
Glyph of Renew
Glyph of Circle of Healing
So with the changes to Prayer of Healing that it now can be cast on other groups in a raid, I have been considering swapping out the Renew glyph for the PoH one. I think the HoT effect from Glyph of PoH would be very nice, since there are boss fights in Ulduar where PoH comes in very handy (Ignis, Mimiron, Hodir), and be more of a benefit than the 25% extra healing of a Renew that is 3 second shorter in duration.