It's really funny because by accident this morning I landed for the first time at the chinavasion website and I was tempted and bought the bellow gadget.
http://www.chinavasion.com/product_i...-power-supply/
It is a small photovoltaic cell and a battery pack of 1300 mAh. I bought it mostly for my mobile phone but of course I will use it for the cybook as well!
I will write a small review when I get it in my hands.