We are currently redoing the guild bank system. We'll be using "DuckieBank" (http://www-en.curse-gaming.com/downloads/details/6504/ ). What this does is (basically) we have a rank Banker in which we set the bankers to, it records what is in there banks, and as long as you also have the addon you will be able to see what is in those various banks and be able to request items out of them via the addon
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"Jesus Loves you, but everyone else thinks your an asshole"
And more or less.. we're not going to bother sittin around trying to answer questions about whats in the bank. If you wanna know, get the duckie!
Also the addon will only load whats in the bank if the banker is currently online. So once everyone gets it, we can set up dates and times that the bankers can get on to try and allow for everyone to get the data.