HOnestly speaking, as a web deisgner and mobile consultant, I would prefer working from my Treo all the time and would do it more if it were easy to dock it into the desktop and then continue to use it there (plus a nice HD for archiving and storage). With Dragon Edit I really do have the ability to do some sites quite easily (such as this one:
http://antoinerjwright.com/portfolio/LOH/design1.htm) and if I had a better browser at my disposal, then I would do even more.
Come to think of it, the PalmOS could do this considering how it can read multiple memory cards (Tapwave and Sony did it first, and the T5 did it as well).
But the question of usability is a big thing. Would someone want to, yes. But just because you can doesnt always make it the best idea. There just needs to be different form factors for everyone, but a lot better integration of the software to make the solutions work best for everyone.
(rushed response, my ladi is waiting
)