I'm an opensource programmer with a whole datacenter full of linux servers, and I STILL wouldn't get that.. I hate M$ as much as anyone, but it does have its place. And besides the OS limitations, the hardware sucks:
1024 x 600 resolution - I have enough trouble fitting all my shit on dual 1680x1050s, which is almost 6x the screen space. How could you possibly fit your tracks, a mixer, your plugin windows, etc?
No firewire ports, so you're stuck with a USB one.. 2 channels gets old fast.
2gb ram, 320gb hd, 1.6GHz - cmon, a year ago I put together a desktop that buries these numbers several times over for about the same price..
Good luck upgrading anything hardware OR software.
If you need to be that portable, you could buy the cheapest refurbished dell laptop with xp home for less. And use any interface / daw. And use it for anything and everything else. And while we're talking about 'portable' - When you consider mics, monitors, interface, cables, etc., unplugging a desktop and taking it with you isn't THAT much more effort.