Ideally the PIM apps should all be web 2.0 and the tablet and phone should be able to access that...

Phones do a lousy job as anything other than a simple means of communication. Their form factor should be small and pocket-able and have BT for DUN when a broadband is not available to the tablet IMHO.

The screen size of the N800 is just about right and the size and battery life make it perfect for casual toting in a purse or inside jacket pocket.
It doesn't or shouldn't have to be with you all the time and could spend a lot of time in a car dash pocket or briefcase.

Even folks like me who watch cartoons and read comic books can understand this by just looking at D. Tracy, George Jetson, and Capt. James T. Kirk... These dudes from the "future" did most of their away data communications from their vehicles but their personal voice communicators were so small you hardly noticed them.

I like the direction the N800 is going. I have been trying to accomplish this for the past two years with WinMo 2003 on a WiFi/BT iPAQ.
Everything needed to be reloaded if the battery went dead, commercial apps left a lot to be desired, M/S apps needed to be translated to and from the device, development was stopped on the OS after only 2 years, and the new OS would not run on the old hardware...