So, you can't kill a healer

Healers seem to be getting everyone's goat these days. With resilience capping out and stamina easily over 10k, healers are the new pvp tanks. Ret can have problems when dealing with them but here's some tips to help you kill a healer (most of the time).

1) Don't go all out early on. Let your seal and white swings do the work for awhile so you stack vengeance or just wear away at their mana pool. Don't worry about CCs right off the bat, let them happen if they're intent on doing it.
2) CS every time it's up. Easy peasy lemon squeezy.
3) If they're spam dispelling you, use rank 1 seals. Not an issue in a week. Priests will use [i]much[/i] more mana trying to remove your seal than you will sealing up rank 1.
4) Once you have them at about 50% from just swinging and CSing it's time to blow them up. If you're reasonably sure you won't be CCd in the next 6 seconds throw your HoJ right before your next swing, trinket, judge, CS. This should get them relatively low if they haven't pvp trinketed out. If they're not dead and just really low it's time to use your next interrupt before they heal. Wait until the very end of whatever they're trying to cast and use repentance. Now you have 6 seconds. Heal, reseal, dance, and then judge command. If they're STILL not finished off then if you're lucky enough to be BE, arcane torrent and HoW. During this whole HoJ/repentance cycle it's important to be very fast on the defensive abilities. Trinket out of fears/stuns, bubble if you really have to.

Here's some class specific tips.
Druid) JoJ. JoJ. JoJ. Catch them out of form with your hammer. If they're in bear form they're not healing anyone so put pressure on someone else while they waddle around. If they're your only target then keep on them and don't burn too much mana on judgements. If they pop frenzied regen (especially if they had no rage to begin with) stop attacking them. Hell, sit down and drink if they'll let you. Chances are good they'll freak out and burn stuff they really shouldn't if you do that, like feral charge and bash.
Priest) Just let the seal and swings do the talking. Don't trinket out of the first fear unless you're positive you can get back on them and finish them off in that time. Let them spam dispel you, it costs them a GCD and plenty of mana. If they mana burn you jump around like a madman. Healers aren't always used to people getting behind them while they cast because they rarely need to cast offensively.
Shaman) Rank 1 seals because purge is cheap, but not as cheap as rank 1. Judge something on them, whatever you like, because they can't remove it from themselves. Watch for grounding totems that will eat your HoJ and repentance. Use HoJ when their earth shield is down or on another target.
Paladin) lol You should know exactly what it takes here. If they're stacking resilience to the heavens they really have no serious healing power and you can just stand there auto attacking waiting for vengeance to stack. Once you get some lucky crits drop the hammer and let them have it. If they choose to use BoP remember that you can keep them locked down for the entire duration of it with repentance and HoJ, also judgements and HoW aren't affected by BoP.

In a situation where a healer doesn't have to be your main target it's often a better strategy to just remove them with your stuns and interrupts and kill the person they're supporting.