Watching the
answer of Mercedes to BMW's iDrive, I think the dashboard screen makes a perfect web-browsing interface.
And if it is a simple web browser built-in, why not make an online banking clone for this "channel" as well? The challenge is to make use of the dial-like navigation device and how to input numbers with it.
I wonder what can be the use-cases for "car-banking", if you have any idea, comment me please.