Thanks for the welcomes. Thought I'd post the basic setup and macros I'm using, any suggestions on what may be more productive would be appreciated:

Main on the left screen, slave on the right. Both priests.
"Big" button found in one of the "macro basics" threads bound to the [`] key.


Then, on the main action bar I've bound variations of the following:


#showtooltip
/cast [help] Renew
#showtooltip
/cast [harm] Shoot
#showtooltip
/cast [nocombat] Shoot

On the following keys, based on the above conditionals:

1: Shoot/Renew
2: Holy Fire/Flash Heal
3: SW: P/Lesser Heal
4: Devouring Plague/Heal
5: Holy Nova/Cure Disease
6: Smite/Dispel Magic
7: Mind Flay/Fear Ward
8: Mind Blast
9: Mana Burn

Basic combat has the main target, slap [`] for slave assist, Holy Fire, SW:P, Devouring Plague, Wand, Wand, Wand, Holy Nova

In this pattern, I'm running around 15-20 mobs without drinking, assuming no unexpected adds or spawns.
The Holy Nova at the end finishes off whatever manages to get to me and heals both priests in one step.
When a mob dies, one toon gains Spirit Tap, and is thus a little ahead in mana than the other. I find that Spirit Tap generally alternates between the two, coincidentally. Could just be interpreter bias.

That said, any suggestions to improve productivity?