A small form factor PC

VIA has been producing a series of Mini-ITX motherboards for some time. Recently it introduced a so-called Nano-ITX board with the size of 12 x 12 cm. There are plenty of PC modders using Mini-ITX boards to build many weird-looking PCs, which can be seen from mini-itx.com. But what really raises my interests in Nano-ITX is the JDOS project. The project promises an embedded system running Linux and Java. I have been dreaming about using the cellphone systems running J2ME as the microcontrollers for robots. What advantages does the JDOS solution have over J2ME? The other thing that baffles me is about the real-time operation in Linux. Some people claimed that Windows CE naturally supports real time operations but Linux does not. Does J2ME have real time capability? And why are there so many questions in life without answers?