I have wanted a HTPC to put into my entertainment center for a long time. The trick for me is finding one small enough to fit into the cramped space I have. VIA has unveiled a new machine today that is crazy small.
The SFF PC is called the ARTiGO A1100 and is packed in a sub 1-liter chassis. The small rig is only a bit larger than a mobile phone at 5.7" x 3.9" x 2" and packs in decent hardware and connectivity.
The machine runs a VIA Nano 1.2GHz processor and a VIA VX855 media system processor. It also has lots of connectivity with HDMI and VGA out as well as Ethernet, USB ports, and optional WiFi. The small machine is available for $234.