I have made an Arduino compatible shield using the ESP-03 module. It is open source hardware and software.
The Kickstarter ends in 28 hours:
https://www.kickstarter.com/projects/90 ... ifi-shield
I have released version 1.0 of the library together with some sample code. (The library is still a work in progress. Everything in it works, but I will add more features.)
Download: http://www.zeptobit.com/8266wing/
Updates on the project and some sample projects I made using the shield:
http://hackaday.io/project/3749-wifi-sh ... 266-module
Emil