I'd like to announce the Babyduino project which provides a set of simple circuits based around the AVR ATMega CPU's that can be used with the Arduino IDE to build your own projects around.

The project has it's own project page as well as a GitHub repository that contains all the source and assets you need.

At the moment the project is very much a work in progress - initial working versions (along with sample projects) will follow over the next week or so.