I have the luxury of 2 laptops one for infrastructure demos and one for the day to day stuff most of us need to do. I have added luxury on top of that becuase my day to day machine is a multi-touch tablet (Dell XT2). Before I get the iPad comparison comments at the end of this post about multi touch screens, I would agree the iPad wins hands down on feel and precision.
However I can use the optional stylus for real precision, plus I need to run random stuff on my laptop like Adobe Photoshop to edit my sketches for print & online use..
and Microsoft Expression encoder / Live Movie Maker for videos on top of all the usual office applications any IT professional needs to use.
I also need some of the other hardware that this tablet has:
Sure it is heavier, more expensive and has less battery life than the cool gadget of the moment, but I only need one device and one mains adapter to be able to do most of my work and keep up to date with the world.
No comment on the actual point of your post - but the sketch is really impressive. Nice one.