Net as you say is already widely used for business apps, some of which can be incorporated into these devices.
Currently Google Apps Script does not allow connection to internal (behind-the-firewall) corporate databases, which is key to building business apps.
You remember the hot project where the company failed to receive the ROI they expected since the business app failed to integrate, in other words play nicely with others.
However, Google was not in the business of creating special business apps, such as for project management or accounting.
More and more business apps are being created every day.
The free business app was designed to provide private practice management information for medical students and doctors.
Those internal business apps are usually so bloody ugly and painful to use that nobody would notice or care how rough the compatibility mode software was.
All your business app in one login, anywhere.
I can see some possible use for dedicated business apps, but the burning question is what this will do for battery life...
When I see those Microsoft Courier demos, I think that is closer to the type of interface that business apps could utilize.