I could spend some time improving the industrial design, but that's what Apple does best. This image is heavily inspired by Sony's AirBoard, as seen on their website.
What's important is not what this thing looks like, but what it DOES. And you don't have to wait for Expo, it's in the shops now (in Japan, in the older 10 inch version, the 12-incher is out January 25th). The cost is around $1,000.
There are 3 components, base station, monitor and cradle. The monitor contains batteries which are recharged from base station or cradle. The base station has modem, TV antenna, video input, USB and ethernet connections, and communicates with the monitor by wireless (IEE802.11b). The monitor contains speakers, headphone jack, a 12-inch touch screen and memory stick. It runs its own OS and proprietary software including web browser, e-mail and photo album.
If Sony can do this NOW, just imagine what Apple could make of it. A slightly bigger screen, hard disk and combo drive in place of the memory stick and OS X.
Would this be enough to cross the line between "a new iMac" and "blown away"?