Swiss Digital Logic offers a the Microspace Media Center PC.
Thanks to a power-saving design, the Microspace does not have a fan and is making no noise. The Microspace is also not much bigger than an external CD drive. As all Windows XP Media Center PCs the Microspace offers integrated functionalities like: TV, digital video recorder, radio, MP3 player, DVD player, DVD recorder, electronic program guide, Internet, mailbox, computer and home server.
No information on if this device is available in the US.
More details on Digital Logic.
Available Media Center PCs.