I currently use a Sony Vio at work. It is a good machine, except for the fact that it is running Windows ME, yucky!!! images/icons/shocked.gif
Anyway, I have used several notebooks including Sony, Dell, Winbook and Micron. I fell that the Sony comes with the best package and has the most bang for the buck. I am not sure about the new models but the Sony I have even came with an Adobe imaging package.
Even though I have only had my ibook for a little over a week (my first Mac), I would give it a much higher rating that any of the PC's that I had used.