Disclosure: I'm co-founder and CEO of Anyfi Networks, so I'm touting my own horn here. ;)

The article doesn't go into enough technical details for the HN crowd but extensive documentation and even firmware images are available at http://anyfi.net. If you know something about Wi-Fi and like system architecture you should check out http://anyfi.net/documentation#architecture. It's quite nice if I may say so myself. :)