MSI unveiled the MSI Wind PC at the Computex 2008.

MSI follows the same concept as Asus with their Eee notebook and mini PC line.
Measurements of the MSI Wind PC are 300x260x65mm, which is about 3 times smaller than the traditional ATX chassis.
The MSI Wind PC is powered by MSI ultra-low-power platform. The TDP (Thermal Design Power) is only 4W, which is 16 times smaller than the general desktop processors and 9 times smaller than laptop processors.

MSI is holding back on the detailed specifications, but it is safe to assume that the MSI Wind PC is based on the Intel Atom CPU.

Other features of the MSI Wind PC include 160GB 7200 SATA HDD, 7.1-channel audio, Wi-Fi, and built-in TV card.
Via this MSI announcement.