For me, it's Swiftspell's Staff. I have those coming out of my ears right now... It's come to the point where I've been able to give one to everyone in my guild and they STILL keep dropping like they're going out of fashion
Granite Slabs. "Xxx has dropped 13 slabs of granite which your party reserves for X X." Yay. I'll tell you exactly what you can do with that slab of granite! It irks me to no end that they have increased in value thanks to consumables.