I'm running a 2 mage team with a druid tank.

Althought slightly different, I've found that I really dont need to worry about keeping the mages back.

I used to just hit the back arrow when the druid charged, but found the druid held enough aggro on a single target after the charge not to worry about it. If the mages pull aggro I taunt and it gets the mob right back on me. I also tend to arcane explosion if there are a few so the mages being back a bit hampered me.

With the shaman you can cast a lightning bolt within melee range and wont suffer from interrupts if the druid has aggro. You can also (if you have it, drop fire nova totems).

At 43/44 my druid tank is doing a fair old bit of damage himself.

Also if the mob you are going up against is a squishy you can use cat form.