This instructable details my efforts to make a simple solar battery charger made out of a playing card, some solettes, some magnets and super glue -- if anyone has ideas on how to make this simpler and more effective, please let me know in the comments.
No soldering is required for this project. It should take about 10-15 minutes.
First, check out this video. There are two playing-card solar projects detailed in here -- one for a AA charger, and another for an arduino charge card (described in more detail here: http://www.instructables.com/id/Solar-powered-arduino-on-the-back-of-a-playing-car/ )
p.s. Where can you get the small bits of solar cells -- the solettes -- needed for these Instructables? Well, it's a pain right now. You can track these puppies down from suppliers in China, but they aren't easy to pin down: http://manilamantis.wordpress.com/2012/04/25/the-dark-side-2/
So, to make this easier, my buddies and I are launching a Kickstarter campaign (Aug 15 - Sept 14) for all your solar DIY needs: http://www.kickstarter.com/projects/alex9000/the-solar-pocket-factory-an-invention-adventure Bangorang!