I've never used this, but I'm forced to help one person a week. Lucky you!
http://www.wowinterface.com/download...BankStack.html
Edit: All kidding aside, I may actually use this addon. I was using MrPlow awhile ago, but I hated that it moved my hearthstone (I keep it in the same place it puts it when you create your character.). BankStack allows you to ignore spots, which at the time (maybe not even now) MrPlow doesn't/didn't do!