AT AVR BUTTERFLY: Atmel AVR Butterfly, Demoboard with ATmega169 at reichelt elektronik
C Programming for Microcontrollers : Featuring ATMEL's AVR Butterfly and the FREE WinAVR Compiler by Joe Pardue (2006, Trade Paperback) for sale online | eBay
Making the Butterfly Beep
AT AVRBUTTERFLY development kit for the ATmega169 - YouTube
Smiley's Workshop 29: SPI and the AVR Butterfly DataFlash | Nuts & Volts Magazine
AVR BUTTERFLY | Microchip Technology
AVR Butterfly | A self-contained, battery-powered demonstrat… | Flickr