VIA introduced a new form factor at their VIA Technology Forum 2003. The Nano-ITX motherboards are even smaller than VIA's EPIA Mini-ITX motherboards.
Chen reviewed the incredible success of the VIA EPIA Mini-ITX mainboard series, as in just over 18 months it has inspired hundreds of companies and individuals to create new form factor PCs and digital lifestyle devices with enhanced digital media, networking or communications capabilities, as well as numerous unique case mods.
He then displayed the VIA Nano-ITX mainboard, at just 12cm x 12cm, the smallest ever standard platform with full PC functionality, which is ideally suited for the next generation of smaller, quieter, digitally intelligent home, office, mobile, industrial and commercial devices. Declared "the shape of things to come" by Chen, the Nano-ITX board will be launched later this year.
I found some more information and photos of a Nano-ITX motherboard over at Mini-itx :