An EEEPC is an ultra-portable laptop made by Asus. Chris's model is 7.1" diagonally (very small). They are quite powerful for their size, and some have exceptionally long battery life. (some up to 9.2hrs depending on type of use)
Rather than a moving hard disk like other laptops, the eeepc use a SSD (Solid state drive) which is somewhat like a SD card, or a USB flash drive, This lessens the power requirement, makes the system faster and generates less heat. SSD's are also more tollerant to harsh jolts etc, where a conventional hard disk would fail..
To top it all off, the eeepc's are relatively cheap, starting at $399 (depending on where you shop)...
You can buy them with bigger conventional hard drives, but for an astropc, theres just no need..
I'll be buying one soon, I'll use a USB hub to split one of the USB ports to 4, so I'll have 6 ports available, I'm just hoping the machine will run everything I need it to (CCD, Guiding, the sky+EQmod, usb focuser) and hopefully I'll be able to make a table and sit it under the tripod of my mount, keeping my setups footprint tiny.. make a little canvas tent to cover under my mount and hey presto - dew protected pc-controlled setup, with no wires hanging out for people to trip on in the dark!
Oh my I've started to rant/brainstorm in an open forum..
Cheers.
Alex.