Things I like about the iPad: looks closer to 1.33 form factor (4:3) - and letter sized paper is about 1.3, which means with the proper screen they could get decent horizontal resolution in portrait mode.
Things I like about the Win7 tablet: ports, full OS (which also means greater software choices), full on-screen keyboard, could use so many of the programs I am use to, in a pinch I bet I can just plug in my USB keyboard and mouse while putting the tablet on a stand.
What I want: Win7 Tablet with a 4:3 screen (at least 1400x1050) and a digitizer with a stylus. Most of the time I don't convert text - but it would be awesome to use ArtRage or Journal on this. However, I guess I'll have to stick with the bulky M200 or M400 I just bought (M200 was only a 1.5 GHz processor, I wanted to try out Toon Boom Animate 2 and needed a 2.0 GHz dual core so I "upgraded" - and the 1400x1050 screen is sweet in portrait mode. Even my "picky" software will run - you know, the ones that say at least 800 or 1024 width required to install.)