The Midwest Training Group has a revolver-specific class called "Mastering the Revolver". Their 2012 schedule isn't up yet
The Massad Ayoob Group (used to be the Lethal Force Institute) has a 2 day shooting class called MAG-40 (what used to be the LFI "Stressfire" course). That class is applicable to any handgun and is targeted specifically for the private citizen who wants to learn how to defend themselves with a firearm.
The great thing about the MAG/LFI classes is that they teach you every viable option of grip and stance and position and then let you choose the combination that works best for YOU.