This is certainly not an original request but one worth reiterating. With the addition of garrisons and the prolific amount of WoD crafting mats and collectible items, I think this request is as pertinent as ever.

I'd love it if we could simply take the current guild bank implementation and UI and create a server-wide shared bank (separated by faction) to use along with our existing character-specific banks. It would also be neat if BoP profession items (like Hexweave Cloth, Engineering Gears) were turned into BoA as well (or BoP but usable by other characters out of the stash?). (A bad idea as pointed out by /u/Tekknogun and /u/StuffDreamsAreMadeOf.) By keeping shared banks tied to faction & realm, there would be no economic impact by this change.

I'm just sick of having to mail stuff back and forth between characters and using add-ons and 3rd party sites to keep track of all the crap between characters.