Frederick Vandenbosch wrote a great guide for getting started with ESP8266 using the Adafruit HUZZAH breakout module.
Featured Adafruit Products!
Adafruit HUZZAH ESP8266 Breakout: Add Internet to your next project with an adorable, bite-sized WiFi microcontroller, at a price you like! The ESP8266 processor from Espressif is an 80 MHz microcontroller with a full WiFi front-end (both as client and access point) and TCP/IP stack with DNS support as well. Read more.