One of the things I wanted to play with was powering my Arduino with solar. I found a solar charger shield for about $10 that only requires a Li-ion (NiMH would also work) battery and a 5v PV cell. It also allows USB charging.
http://www.robotshop.com/seeedstudio-solar-charger-shield-for-arduino.html
http://www.robotshop.com/content/PDF/datasheet-int107d3p.pdf
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