I just came to the site looking for help with this question too. I'm working with a Pally and a rogue, mostly just to get them leveled. My main dual-box team is 2 priests, which works great, but I'm having trouble even figuring out how to get started.

My thought was finding an unused key on the main and binding that to "move forward" on the other toon(rogue).

Thought I'm also thinking about switching to the rogue as main and Pally as clone.

Keep the idea flowing!