The US$300 InkMedia mobile computer seems to be similar to other low cost laptops proposed for education in developing nations, such as the One Laptop Per Child and the ASUS EeePC. These have no hard disks, to reduce power use and hard disk failures; and use the Linux operating system.
The InkMedia web site makes some questionable claims, such as "cannot get a virus, a worm or ad-ware of any kind" and "never slows down, as it doesn't have a hard disk to de-fragment". These claims are overstated: solid state memory, when used to emulate a disk can have malicious software installed and needs to be defragemented occasionally.
Also the InkMedia's removable keyboard design would appear to make the unit more vulnerable to damage, than the more traditional clamshell design of the ASUS EeePC. The One Laptop Per Child has a swivel and fold mechanism which also may prove to be a point of failure.