I, for one, think it would be silly to get XP on the 420. I'm strongly interested in the 420, but with a second NONE webcam monitor. The whole point of the machine, with the mini viewer, is to be a Vista machine.
I'm tired of windows XP, and the parts I've seen of vista, have me very interested. I almost bought a 410, but thankfully dragged my heels, until this better model arrived. Its SO on my christmas list.
Sorry. Dell has realized that Vista is the best operating system available and won't be offering XP on any of their new machines, unless they loose their minds!