Currently I'm working with the following:
Monk - Main, puller, tank
Cleric - Obviously healer, crucial armor buffs for monk
Enchanter - Mez, haste, clarity #winning
Druid - Ports, extra heals, minor dps, main snare character, SOW
Dual Mages - Obviously DPS (damage shield is kinda nice too)
I started out by getting all my characters to freeport, went to the lowest populated one I could find to avoid attention and just killed orc pawns and crap until level 3 or so, then found which orc pawn spawns directly toward commonlands from the main gate. (it's actually slightly right from the gate if you're facing the gate looking at the zone line to commonlands). This orc pawn has a chance to spawn as a centurian. The respawn is like 10 seconds after the pop dies. Really good EXP until 5 or 6.
At 6, I went to the commonlands. This was brutal. Felt like it took forever to get to 11, at which point I moved to Sro.
In south ro I killed crocs and crap around the beach until 15ish, which I could have killed other things in the commonlands (orc camps), or other camps in north ro.
At 15 I moved to orc highway (it's basically the area around the lake (the oasis of marr) in the northern part of south ro. park your butt anywhere around the beach of the oasis (preferably the north or west side of it) and murder anything that is walking around.
At 19-20 I moved to Ocean of Tears, and went to any "/pick" that had undead island empty. This place was epic. Every skeleton is indifferent con, they will never social aggro. The gargoyles do, but they drop phat money lootz (their eyes are 10p a pop). I stayed here as long as I could, left at around 25.
At 25 I moved to MM and farmed in the little cubby on the map that's just west of the courtyard gates. I'd pull every mob from near the entrance and all the mobs inside of the courtyard. Good loot drops here too. This can take you close to 30, you can easily move deeper into MM, and form up near the castle entrance as well, there are 2 camps there. This will easily take you to 35+ very quickly.
This is where I am at now, currently looking for the next spot. I didn't start this with the intention of being a guide, just as a point of reference to others.
From what I'm gathering, the only places left to really get EXP are inside of cramped dungeons. Normally this would be fine, but on Ragefire, the trains are REAL. I tried my best to avoid dungeon zones as best I could for this reason alone. 'Corpse runs' are the worst without POK!
Once I get 50 I'll most likely drop the subs on at least 3 of my boxes. I love grouping with people, I just hate waiting in LFG and want to level NOW.
Btw, pretty sure I grouped with treehunggindruid the other night in Uguk :P