By Bad Seed
If you are not from a poor country, maybe http://greenenergy.offer4you.org/ products, about bigger systems, might be of more interesting. I don't have any personal experience of their products. They look interesting. If any of you follow that link and try the products, I'd like to hear what you think. If the products are a disappointment and you describe convincingly why, I will remove the link.
This video is an introductory film from Graham Knight about DIY Do It Yourself construction of solar panels (by cutting up large commercial sheets and adding simple connections) suitable for running radios and mobile phones in developing countries. His site: http://biodesign.webeden.co.uk/
He has made a better presentation of this project here: http://www.youtube.com/watch?v=_qT0x9VCWqA