ESP8266
ESP8266 WiFi Module
Espruino - ESP8266 - http://www.espruino.com/ESP8266
ESP8266 WiFi Module Quick Start Guide - http://rancidbacon.com/files/kiwicon8/ESP8266_WiFi_Module_Quick_Start_Guide_v_1.0.4.pdf
Hack a Day
ESP8266 tagged | Hackaday http://hackaday.com/tag/esp8266/
Arduino Support
Arduino IDE Support for the ESP8266 | Hackaday - http://hackaday.com/2015/03/28/arduino-ide-support-for-the-esp8266/
esp8266/Arduino · GitHub - https://github.com/esp8266/arduino
"The basic functions of the Arduino IDE – pinMode, digitalRead, digitalWrite, and analogRead – are available. Most of the WiFi functions work just like the WiFi shield library."
Direct Programming
How to Directly Program an Inexpensive ESP8266 WiFi Module | Hackaday - http://hackaday.com/2015/03/18/how-to-directly-program-an-inexpensive-esp8266-wifi-module/