Work great in low light, and...

These panels work great, and are the best on the market in terms of lightweight construction, reliable connectors, and low-light performance. I use mine to charge a battery pack which in turn provides adapted power to my laptop, camera charger, iPod, and other electronics I often take out.
New PowerFilm sizes are available...
Rollables in 7W, 14W, 21W, & 28W sizes
Foldables in 5W, 10W, 20W, 30W, & 60W sizes

PowerFilm Canada has the latest if you are Canadian.