Womby 0.1
Together with Bas Pijls, we're working on a simple prototype shield for the Arduino. With our shield, code-named Womby, you can use your Arduino to program another AVR chip. We're using an Attiny2313. You can use this board, for example, when you're working on a project where you need more than one arduino/avr.
Using this board you can program as much attinies as you want and use those in your project. Programming an attiny2313 is kind of similar as programming the Arduino. The nice thing about this design is that you can create your own "arduino" like board for a 10th of the costs. You can also program those nice attiny45.