I saw this Sony set top PC today at Sakuraya. It's a PC meant to be put under the TV. Acutally, it comes with a display. It's clearly meant for the Japanese market as I suspect most American's wouldn't want a 15 inch display for their living room TV. I'm not sure it was 15 inches but I'm sure it was not 20.
It's running Win2K and has a DVD player, TV tuner, FM tuner, MD player/recorder, HDD video recording (ie, Tivo), Memorystick slot, 10/100 Ethernet, USB and iLINK etc and fancy Sony software to control it all by remote. There's also a wireless keyboard for doing PC like things with it.