Toradex have just announced there new Robin Modules which will allow you to run an Intel Atom CPU on a credit card sized board.
The Robix Z5xx Nano COM Express Type 1 Computer Module, can be powered on an Intel Atom proccessor of 1.1GHz (Robin Z510) up to 1.6GHz (Robin Z530). These small computer modules will be great for very small based devices and extreamly small computers.
The boards provice a wide range of interfaces for mass storage device, up to 2GB SSD (on-board), an on-board MicroSD slot and a SATA interface; giving a lot of choose for storage on these small boards.
Sam's Blog 