The Solarbotics edition of the Oomlout Arduino Experimenter's Kit makes learning Arduino microcontrollers fabulously straightforward!
This Sumovore add-on brainboard replaces the standard discrete logic brain with a powerful, programmable microcontroller! (Requires host product)
A 28 pin 8 bit microcontroller in a DIP package as used on the Sumovore Atmel Brainboard add-on.
The Freeduino is based on the open source project version of the Arduino Diecimila. We've adapted the design for more convenience as a semi-kit!
Written by Massimo Banzi (the co-founder of the Arduino Project), this nice little handbook walks you through the open-source hardware/software project that is Arduino!
If you just want to dip your toe in the waters of FreeduinoLand (which is actually also known as "The Fabulous Republic of Arduino"), this basic bundle is what you're looking for.