Not to shit up the Jamba Development thread but what you want is built into a mod called Altoholic. It shows you everything you wanted to know about all your characters. You can 'share' the account data between characters so that Character 1 knows all about Characters 2's skills, bank, inventory etc and then search all that info with a auctioneer like interface.

So if I search for mithril it will show me all my characters who can make an item with mithril, have some mithril somewhere on their account, guild bank etc.

Very handy.

Any luck with getting Jamba as an Alpha/Beta release on Curse yet Jafula?