A great thing about online savings accounts with no minimum balances is that theoretically you can just move all your money to the one currently paying the highest interest! (If it’s worth it.) But, from e-mails I have gotten and other reports on the web, you might want to leave some more spare change in those accounts. Specifically, Capital One 360 and Emigrant Direct have closed people’s accounts without warning for having balances of less than $1. On top of that, Emigrant doesn’t pay interest if your account is closed before the end of the month!
But they have no minimum balance you say. Yes, but in their fine prints they can also close your accounts at any time, for any reason. So I’d advise keeping $5+ in your accounts to avoid account closure and lost interest. This way, if the rate leaders change, your options stay open.