http://gumstix.com/images/09robotics_09.jpg
waysmall computers are complete Linux systems that fit in the palm of your hand. each come in a case with MMC slot, USB Device plug and a power adapter. waysmalls come in way cool configurations.
waysmall systems include: gumstix basix platform, waysmall expansion board, 5V power supply and case.
dimensions: 83mm x 36mm x 15mm (!)
Linux kernel 2.6
64MB SDRAM
4 MB Strataflash
MMC slot
USB Device plug
gcc 3.4 cross-compiler uboot with patches kernel with patches userspace
power requirements: 3.4V - 5.2V takes Li-Ion, Li-Polymer, 3-NiMH, standard 4.5V or 5.0V inputs