Epson ST120 series is the smallest desktop PC with a size of only 75×185×195mm. Epson has announced an upgrade of their ST120 series with a Core 2 Duo P8400 (2.26GHz), 1GB of RAM, 80 GB hard drive (it can be updated with a hard drive up to 320 GB), GM45 Express chipset, which began in compact Perfect HTPC through a digital TV tuner MonsterTV HDUS and a Blu-Ray burner.
If it is power you want, Epson can also increase your processor with a Core 2 Duo P8600, T9400 and T9600. Regardless, the ST120 with Blu-ray, HDMI and HD TV tuner is sold only in Japan for an equivalent of 1100 €.