Today I updated my github project: GitHub - Paulware/ESP8266: All things related to ESP8266 low cost device
I received the pcb back from China for a small footprint (2 in / 1.25 in), which connects an atmega328 to an ESP8266 running at 9600 baud on D11/D12.
The eagle schematic for this pcb is located in the Schematics/ESP8266Tiny directory.
I created an arduino sketch with supporting files located in the ESP8266UDP_CommCheck directory.
The Arduino project has a serial menu so you can set ssid/password from the Arduino IDE. Ssid and password are stored in EEPROM as well as the unique key which identifies this particular network node. The unit will respond to a udp broadcast from the network master, which could be done from a raspberry pi or an android device.
This device can make a very nice sensor for temperature/water or allow you to drive relays.