I have started providing some of the parts for the projects - just the parts that are harder to come by. I include shipping in the USA, and prefer to only ship to the USA, but may be able to get something into Europe for extra shipping.
The Spectrograph project has been improved. I removed the OpAmp and its non-linearity in favor of digitizing the output of the CCD directly. The results are better than I had hoped.
You can now find all of the solar projects on the Arduino Solar Projects page.