Gigabyte recently rolled out a new small form factor case called the Essence for DIY PCs. The chassis measures 300mm x 234mm x 74mm (~11.8" x 9.2" x 2.9"), comes bundled with a 120W PSU, and will happily hold a Mini ITX motherboard and laptop-sized hard drive. Large mesh vents on the side panels allow for plenty of airflow and ventilation to run a fanless system.
The Essence case uses a SECC frame along with ABS plastic. A rectangular base, which hosts the front IO ports, holds the machine vertically and at a slight backwards tilt. The DC power components are mounted to the bottom of the motherboard tray and are driven by a 120W external power supply (Similar to the type of setup the Xbox 360 uses). The red removable motherboard tray (accessible via the right side panel) allows you to screw in a Mini ITX motherboard and a single 2.5" SSD or HDD up to 9.5mm thick.
The front IO includes two USB 2.0 ports, one headphone output, and one microphone jack. Aesthetically speaking, the Essence looks nice with its red faceplate, silver power button, and black mesh side panels with embossed shapes. It is small enough that it could easily sit next to a monitor and act as a low power desktop or next to the TV as a home theater PC. So long as you do not mind it not fitting into an AV rack/stack, this case could be used along with a cheap SSD and fanless Bay Trail or Kabini-based system for a silent media box or streaming client for Steam games.
The Gigabyte Essence is now available in Japan for 13,800 Yen or approximately $125 USD. It comes with a one year warranty. There is no word yet on availability in other countries at this time, however.