This is probably one of the best explanations I've read on the usefulness of mages, and how to get along with other classes.

As an enhancement shaman, I often ask on trade after logging in "LF Mage to conjure 3 stacks of lvl 65 water, 3 stacks lvl 65 food, tipping 2 gold". It feeds my mana-inefficient combat, and provides good money for the mage who had the patience or money to buy the tome.