This may work actually. I'd be interested to hear the results, although O2 internet tethering is nearly £10 a month, which isn't really worth it just for the BMW Internet browsing capability.

It only works while stationary, and you need the iPhone handy, which already has a pretty decent browser so what's the benefit? Guess it depends on how well the iDrive works as a mouse, and if the graphics of the BMW browser are vastly improved over the BMW online portal i.e. it needs to offer a better browsing experience than the iPhone 4, which I doubt it will.