while we're on this topic, maybe this one is also interesting (all the more so because it's already available afaik):
http://www.solid-run.com/products/cubox
Named by combining the words 'Cube' and 'Box' and while being less than 2"3 in size, the platform can stream and decode 1080p content, with desktop class interfaces, all in less than 3 Watt (*) and less than 1 Watt in standby.
The platform is based on Marvell Armada 510 SoC and includes the following key features -
Linux based distributions like Ubuntu, Debian and others
Android
800 MHz dual issue ARM PJ4 processor, VFPv3, wmmx SIMD and 512KB L2 cache.
1080p Video Decode Engine
OpenGL|ES 2.0 graphic engine
HDMI 1080p Output (with CEC function)
1GByte DDR3 at 800MHz
Gigabit Ethernet, SPDIF (optical audio), eSata 3Gbps, 2xUSB 2.0, micro-SD, micro-USB (console)
Standard Infra-red receiver for 38KHz based IR controllers.
No JTAG required. Unbrickable for Developers (**)
100€, so not a 15$ supercheap gadget. including PSU and case (and µSD card), though. projected 15$ price for the rhombus thing is really barebone, full-100k-pcs-volume-discount price, so I kinda doubt they'll reach that..