This really isn't much of an exploit but if you are a ret paladin and your trying to get every ounce out of your burst damage you can make a macro that has you equip your 1h sword and offhand (offhand can either be a shield or just any +spell damage offhand) and the sword of course is a spell damage weapon so once you hammer of justice someone you can judge seal of command with about 160 - 180 extra spell damage then swap right back to your 2h weapon before your next swing. Just drag your 2h weapon on your tool bar to re-equip it since the global cooldown screws with the macro so it can't swap back to your 2h. This added about 50 DPS to my friend when he was doing this.