Fyi, DX carries a similar module with a few gpio pins, 2x uart, 2x ethernet, and wi-fi. It has 4mb flash and 16mb of ram, and runs openwrt. $15 incl. shipping
module: http://dx.com/p/hi-link-hlk-rm04-serial-port-ethernet-wi-fi-...
convenient breakout ($30): http://dx.com/p/vrm04-multifunction-uart-serial-port-to-ethe...