A few weeks ago I stumbled across the ION demo videos on YouTube. In case you haven't seen it:
http://www.youtube.com/user/NvidiaIon
http://www.nvidia.com/object/sff_ion.html
Basically they took Intel's 1.6 ghz Atom processor and paired it with their GeForce 9400m chipset, which increased performance while decreasing power draw. They estimate the cost would only be about $50 more than Intel's current Atom package offering. (Which is an old, slow chipset that runs really hot compared to the Atom itself.) This got the ol' gears turning. Why not build a handheld netbook tablet, so you can get real on-the-go computer fixes without using traditional PDA crippleware?
An hour later, this fell out of Photoshop:

Smaller than an Apple Newton, bigger than a Fig Newton.
Basically it's an EEE PC based on Nvidia's platform, crammed down into a fat PDA. It would run a tablet PC edition of Windows 7 (because it would take that long to put together), since it's basically a miniature slate PC.
Instead of built-in controls, it could snap into different cradles that connect via the dock port. There could be one for gaming that adds PS2 style controls to it (replacing the analog sticks with something similar to the PSP's more pocket friendly analog thing), and one that adds a thumb-size keyboard like the Samsung Q1's.
If you look up videos of the Asus N10 netbook running games, you'll get an idea of what this is capable of. (The N10 has the 9300m.)
Additional features I forgot to add to the image:
- At least 32 GB SSD or 120 GB Microdrive (similar to the iPod Classic's)
- Splashtop (the web environment Asus markets as ExpressGate that boots in 5 seconds)
- Roughly 5.5 x 3.25 x .9" (at least that's how big my cardboard mockup is)
- OLED screen if they can be made to spec cheap enough
- Dock would include DVI, VGA, Ethernet, additional USB, and audio ports, and a standard-size laptop DVD drive, in a case the size of a desktop optical drive.
- Screen can be used in landscape or portrait mode (I think Nvidia already does this with their drivers; ATI and Intel do.)
- 1 standard DDR2 SO-DIMM slot
The only main issues I see at the moment are battery life and cooling. Depending on how warm the chips get, it could be possible to run under an inch thick. Battery life is tricker. Obviously it would need a proprietary lithium battery, but they make those pretty small now. (the one in the iPod Nano is about 800mAh and it's freaking small...)
If you want I could try taking pictures of the cardboard mockup against other devices... But it's about the size of the original DS.
TL;DR: Imagine playing Call of Duty 4 on a computer a little bigger than a PDA.
What do you think?

