While I was stumbling the Internet, I stumbled on to Picotux website. When the first time I saw the pic above, I thought it was just a connector that we can use on our PC. But after I read the description below it, I am so impressed!
Picotux 100 is the smallest Linux computer in the world. With 35mmÃ—19mmÃ—19mm in size it uses uClinux 2.4.27 Big Endian as its operating system. It built with 8Mb SDRAM and 55Mhz processor to run the OS.
For more information, you can visit Picotux website or read the details here.