According to a LinuxDevices.com article, embedded controller maker Glomation has announced a new ARM9 single board computer for $69, the GESBC-9260E. It looks ideal for robot applications with a 200MHz Atmel ARM CPU, 64MB SDRAM, 128MB Flash, SD slot, 10/100 Ethernet, 2 USB host ports, 1 USB device port, 3 UARTs, 1 RS-485, I2C bus, SPI, real time clock, watch dog timer, 3 16 bit timers with PWM capability, 1 20 bit timer, 4 channel 10 bit A/D, 20 GPIO pins. It runs on 5V drawing less than 400ma. It's supported by Linux 2.5.25 or newer kernels and the GCC 4.2 tool chain. For more see the full GESBC-9260E specs on Glomation's website.