2 vga , as has been said, doesn't cut it.
I was thinking the other day (gasp) that something slighty bigger than a z (maybe an inch in width and height, as thin as possible) runing a dual arm proc. / 2700 video setup with an 800x600 screen, 256 or more ram, a 1.8" 40 gig hd and a serioulsuy biiiig -- battery (w/ bt and wifi internal , af course). would be more the thing.--clamshell , of course.
Id' be happier with this, in combo with my little nokia casket phone, than with a an intregrated setup. If it were possible to integrate a phone and add a bt headset + remote that would be cool too.