SparkFun's minimal design approach to Arduino. This is a 3.3V Arduino running the 8MHz bootloader (select 'Arduino Duemilanove w/ 328' within the Arduino software).
This is a 3.3V Arduino running the 8MHz bootloader, in a very small package - a Mini Arduino, you might say!
This is LilyPad Arduino, the heart of a wearable electronics system! This main board features a ATmega328 preloaded with Arduino, and is ready to connect to a wide variety of wearable, sewable modules!