beagleboard from TI

Hardware:

* OMAP3530 processor delivers laptop-like performance at handheld power levels
* Over 1,200 Dhrystone MIPS using the superscalar ARM Cortex-A8 with highly accurate branch prediction and 256KB L2 cache running at up to 600MHz
* OpenGL© ES 2.0 capable 2D/3D graphics accelerator capable of rendering 10 million polygons per second
* HD video capable TMS320C64x+™ DSP for versatile signal processing at up to 430MHz
* USB power

not bad when compare these features with $149 USD