it's faction neutral, so both the horde and the alliance can use it. it's connected to the AH in Gadgetzan and there might be one somewhere else that i'm forgetting at the moment.
so if you're alliance, and BoE shaman gear drops, that's where you go to sell them.
edit: everlook, that's it
Edited, Dec 19th 2006 3:19am by nipplehead