I stumbled across this guide today: http://dulfy.net/2013/01/16/gw2-useful-and-fun-consumables-guide/#more-25372
Some of the more interesting consumables include:
Portal gun
Seed Turrets (yes, you can buy these!)
Healing Seeds
Med Kits
Fire Elemental
Hazmat Suit
Guess where I'm going to be exploring!