I've been leveling RDM recently, I'm really enjoying it and definately taking it to 75. While I can't profess to being the best RDM on this server, I'd like to think I'm about adequate.
My usual party playing style is like this (This is if we have a WHM curing, I'll post my main healing plan down below also):
Stand Up, Cast Refresh on self.
Caste haste on tank.
Cast Dia and Gravity on mob.
Refresh tank (if it's a PLD tank) or Refresh WHM (If it's a NIN tank)
Haste slow DD (DRG, DRK, WAR with G.axe etc.)
Slow and Paralyze on mob.
Refresh any other MP user (BLU, DRK, BLM)
Haste any other DD if the mob isn't dead yet (Usually on Colibris at the moment they're dead when I get up to this stage, I usually Haste them first next round)
Nuke if the mob isn't dead yet. Try and MB if the SC hasn't gone yet.
Now for if I'm main healing:
Refresh self, Haste Tank
Dia, Gravity, Probably Cure II if it's a PLD.
Refresh other magic users
Haste 1 slow DD if they're really struggling to SC
Blind, Paralyze, Slow, Cure Spells.
Cure.
Cure.
Cure.
Try start resting when the mob is at 10%~ if it's a PLD tank, they can cure themselves
My gear isn't up to any presentable state yet, but I do have two NQ level 54 INT and MND rings, and an Ether and Electrum. Obviously they're switched in for the appropriate nukes and spells. My damage is kinda lacking on nukes but then again I really hate Tier II spells since I don't know where I stand while bursting them, and they usually get resisted (even with 5 ish merits to Elemental).