[SirAlvarex]

Shaman / Monk is a great combo. Heals, pulling, DPS, debuffing, buffing. Everything is there but Porting. But how often do you really need to port?

Mage / Mage is a good combo for obvious reasons. Pets are very powerful, so having two of them makes them even more powerful. It will also allow splitting of camps of up to 4 pretty easily.

Enchanter / Mage (Or anything with an enchanter) makes a great combo for the pulling, downtime mana regeneration, and the awesome buffs.

Typically Warriors and Clerics are both pigeon-holed in their responsibilities that they don't make a great duo-partner.

Rangers would be great if their abilities didn't overlap those of their most logical partners. Heals and buffs won't matter with a Shaman, and all of their spells bring nothing when a Druid is paired up. Maybe Ranger / Cleric, but that leaves a lot to be desired.