Love the idea, I was about to sign up when I realized that it isn't done automatically, that's kind of a deal breaker for me. When you get the Yodlee integration send an email out :)
The problem is that Yodlee is very expensive to get started with financially, (not technically). The point is to get people excited about the project and to sign up now, to convince someone to foot the cost of yodlee and keep all the money flowing to charity.
It would be nice if banks offered a simple API to tap into in order to get access to ones account details. I know the BankSimple guys are planning on having Oauth support in able to allow people to build services around their service and now have to go through Yodlee necessarily.