SparkFun's minimal design approach to Arduino. This is a 5V Arduino running the 16MHz 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!
You need to wedge an Arduino into a really tiny spot? Simple - just use a SMD '328 IC. Oh... you want a reset, and voltage regulator too? Why didn't you say so!
This is LilyPad Arduino, the heart of a wearable electronics system! This main board features a ATmega168V preloaded with Arduino, and is ready to connect to a wide variety of wearable, sewable modules!
This is just the PCB for building the MEGA Protoshield
Sometimes a gentle "beep" and "boop" isn't enough from a microcontroller. The Adafruit Wave Shield adds these audio capabilities to your Freeduino SB / Arduino!
Intertoobs. Intarwebs. Series of tubes. Whatever. Connect your Arduino / Freeduino SB to your LAN, WAN, or whole darn Internet!
Starter pack designed for the hobbyist for PICAXE experiments. 18X supplied, but supports all 8,14,20,18,28,40 PICAXE sizes. Complete with Serial programming cable.