I find that, for max dps, its best to get 5 stacks of Truth and then swap to Righteousness, swapping again when you need to refresh the dot.
The dot is where the damage of Truth comes from now- the procing itself only does 3% weapon damage, compared to, I think Righteousness is 12% weapon damage now, or 10% or something high?
2) Battle Healer does nothing for healers.
3) All glyphs depend on fight. Physical damage with little-to-no magic damage? DP. Single Target with no need for snap threat on adds? Focused Shield. High raid damage and vengeance? Battle healer.
For a typical 5-man I go with DP, Battle Healer, and Alabaster Shield, but honestly in 5-mans it doesn't really matter, on my main spec I go with whatever glyphs I used last in raid - not even worth the tome to switch them.
Currently a 14/14 Holy Paladin and 10/14 Discipline Priest in Siege of Orgrimmar
Formerly voidspark - 8/8 Demonology Warlock and Restoration Druid in Dragon Soul