The World of Warcraft Mobile Armory was recently updated with guild chat capabilities, in addition to its previous auctioning capabilities. It can do a fair amount, but what other in game actions would you like to be able to do from your cell phone?
Would you like to be able to craft items? Update your mods? Perhaps raid Argaloth, the Loot Piñata while on a bus? What about repairing or selling items to vendors? Equipping different sets of gear? Unequipping all of your gear and dancing on a mailbox? Fishing in game while you're out fishing on a lake? Would you like troll trade chat while you're stuck at Chuck E. Cheese's? Because if I must suffer then so must everyone!