Solarpowered mobile office

Patrick reports at Will Blog for Experience on his efforts at low cost (around £100), portable solar power sufficient to power a laptop. He says it weighs about 2lbs, costs around £100, and powers his Macbook for nearly two hours (1.83ghz, browsing the web and checking email via Airport Extreme, bluetooth off, screen brightness about 70%) with five hours of good sun, though as he says: "Through trying this out, I found that it is very hard to get 5 hours of good sun in Chicago in the winter. It's a great feeling when it works, but not practical for day-to-day use."