I figured with the rash of account hacking people have suffered, I figured I'd throw this up.
I noticed that through the
wow armoury, you can log in with your account name and pwd to see the guild bank contents. Unfortunately, as far as I can tell, this login procedure does not appear encrypted in any manner (i.e. no https).
Seems like a pretty major oversight on blizz's part to me. I would suggest not entering your account information through the armoury.
*EDIT* There is link to do a secure login on the upper right corner of the armoury page (
https://www.wowarmory.com/login.xml), however if you go view the guild bank you will receive a login prompt that is not encrypted/secure (
http://www.wowarmory.com/login.xml).