Shuttle XS35V2 - Atom D525 1.8 GHz - 0 MB - 0 GB

The XS35 V2 is so slim that it's just 38.5 mm. This slim PC is ideally designed for space-saving where space is critical. It fits easily into any environment and the ability to be mounted behind a LCD TV or LCD monitor with VESA mount capability gives it the extra score on your list. The internal layout has been meticulously engineered to require no fan, so it's not only quiet and low in energy use, but also dust-free and virtually maintenance free.