Think about it—an inexpensive Linux PC crammed inside a wall-wart plug. Something like this SheevaPlug could open up a whole new framework of managing and sharing data that could be accessible to the masses. Inside the SheevaPlug you will find a 1.2GHz, ARM-based Sheeva embedded processor, 512Mbytes of FLASH, 512Mbytes of DRAM, gigabit ethernet and a USB 2.0 port. Plug it into a wall socket and bam—a fully-functional Linux server that can store digital media accessible remotely via the internet or function as a remote print or web server. Plus, it supports “multiple standard Linux 2.6 kernel distributions” and it operates on only 5-watts of power

The rest is here:
SheevaPlug: A $99 Linux PC Crammed Inside a Wall Plug [Linux]