I've got my disc set up on the numpad keys, 1-5 is for each toon in the team, and then mod keys do different spells.

nomod is a castsequence of penance, and then enough flash heals to compensate for the CD (at work right now, so don't know the exact amount), with a reset=10 (I think that's the CD on penance with the glyph).
mod:ctrl is renew
mod:alt is PW:S

numpad 6 I use for spells that I'm probably only going to be casting on the tank
nomod is Prayer of Mending
mod:ctrl is Prayer of Healing
mod:alt is Pain Suppression

Holy Nova's on z.