The biggest hurdle to widespread adoption of mobile banking, of course, is consumer concern about security. Financial services firm KPMG says . (Of course, everyone is comfortable with letting a restaurant waiter take physical possession of their credit card for 10 minutes.)

But that's mainly an age thing. Young people aren't so timid. The use of mobile banking has in the past year among young adults in the U.S. Some 21% of Americans between the ages of 18 and 25 are doing banking via cell phone, according to a survey by Mercatus LLC.

Research firm TowerGroup says 10 million people now do mobile banking, but that the number will rise to over the next four years.

If you know where to look, there is incredible innovation happening in the banking space, especially in how customers interact with banks -- and their money.