grigorusha Elemental Cube - world's smallest Rubik's Cube 8mm
world's smallest Rubik's Cube - for sale
its full functionaly Rubik's cube in small size (8mm)
forum link - http://www.twistypuzzles.com/forum/viewtopic.php?f=15&t=21839
youtube review video - http://www.youtube.com/watch?v=Q0UN50FLwtc
 My puzzle Ten Cube world's smallest Rubik's Cube 10mm (same as Microbic Rubik's Cube 12mm) got into the Guinness Book! and I'm absolutely nothing to do did not do;)
http://www.guinessworldrecords.com/Search/Details/Smallest-Rubik's-Cube/74256.htm

very interesting: 8*8 mm cube placed in a 08/08 day

how to assemble this Cube:
http://www.shapeways.com/forum/index.php?t=msg&goto=33589