Solar chargers for gadgets are getting better all the time.  The Solar Gorilla produces up to 10W of power in direct sunlight.  Two photovoltaic cells make this small solar charger powerful enough to charge a laptop.  It makes a great travel charger, allowing you to power up while on the go.  It can also be used in any home or office.  Besides laptops, it can be use to charge iPods, mobile phones, GPS devices and just about any small gadget.