Three boxing madness:

58-60: Ramps
60-61: HFP Quests and Ramps
62: Blood Furnace
63: Slave Pens
64 (current level): Underbog

My plan is to go to the next instance every level. Doing this, the levels are flying by pretty fast as, by the time I've come up with strats and farming some gear, I'm almost through the level.

Being able to three box with a 70 prot pally, 64 Elemental Shaman and 64 BM Hunter has been a BLAST. The amount of DPS I'm cranking out is really surprising. The only boss that gave me lots of trouble is Rokmar the Crackler until I was able to come up with a good strat.

For Rokmar, I tried several different things but what worked the best was all out DPS with shaman and hunter. For the first bleed on the tank, I created a macro that would cast Divine Shield and then immediately cancel. This cleared the debuff. For the second bleed, I waited until the bleed effect got me down pretty low in health and used LoH. Being a full heal this would also clear the debuff. By the time the third bleed took effect, the boss is usually dead. I used Frost Resist aura which is 10 frost resist higher than totem and freed up a totem slot for healing/mana totem.

I imagine it may get trickier at higher levels but having three different classes doesn't seem to be as hard as some have said. Maybe it's just that playing 5x the same class is just really simple but the way I have my macros set up, it is one castsequence for pre-pull stuff and one spam in-combat macro for each class. It works really well.

I've also had friends come on runs with me for more ownage. All and all this is what I've dreamt multi-boxing to be.