It's been a good run, but it is now time to say goodbye to the AVR Butterfly, an excellent development system with more on-board features than any Arduino ever dreamed of. Unfortunately, unlike the Arduino, it uses an RS-232 connector and requires a functioning brain to use. Thus goes the 21st century.
So for a limited time only, (until I run out or the heat death of the Universe) I will part with these exceptionally cool and useful antiques for the unheard of price of only $10 + shipping.
I will also throw in an electronic copy of my much commented on book "C Programming for Microcontrollers". With this book, a Butterfly and a USB to RS232 converter you have the opportunity to learn the last real programming language that actually admits that there is a computer involved in the process of programming. If you want to finally understand what is going on down there in all the darkness underneath the excremental language you are now using, you will want to learn C.
Please contact me at firstname.lastname@example.org and make sure you mention in the title either 'Butterfly' or 'I want to have your baby' so I'll be sure and look at it.