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This is a more readable diagram than the chicken scratch one I wrote last Friday.
This shows the Open Hardware modular component design for the custom LED projectors that I have begun prototyping at Eyebeam.
The gray boxes are the mandatory components and the white ones are optional, depending on the design. The idea here is to let others come up with better battery systems and LED bulbs but still keep the structure of this project intact.
Incidentally, if you are looking for a good Arduino startup kit, check this one out from adafruit — just $50. I just ordered one as a prototyping tool for things such as the PWM for the LEDs.