Site down, application error. But if it's essentially your daily balance , i would not want 30 emails a month about my balance. I don't use it enough - and know roughly the balance - and If i need to, i open up Chase's app.
I use mint, it's free. So I can't personally see myself paying $5/mo to get an email about how much my CC balances are.
have you seen http://levelmoney.com? This took mint to the level I always wanted - having real time updates from your accounts all in one place / daashboard.
I don't know how useful an email would be with no correlation to my budget...
how do you get data? do I have to give you access or you are using yodlee?
The idea is good but instead of an email push I would consider a pull system, an aggregator site where you can see all your financial info in dashboard fashion (credit card balance, bank accounts, etc). The problem is that many banks already provide this, or services like Mint. The opportunity I see is in providing a better dashboard that you can customize with only what you want how you want it (in which the offering services fail miserably)