Ally Bank is a small US-based internet bank with more than 1 million customers who has been called one of the least evil, due to not charging monthly fees, not charging fees to use ATMs and offering a good interest rate on savings.
Given that they have no branches and are either internet or mobile based, it would be helpful to add a Windows phone app to their iPhone and Android offering.
Fortunately that is exactly what they are planning, according to their Facebook page. Unfortunately it does seem like it will take a while to arrive, with no time-scale yet, but hopefully the company will not have to wait too long to add to the growing list of banks supporting Windows Phone.
Thanks Ferrarifan for the tip.