Last year we reviewed Eton's
Featuring a extra large, retractable 72 square-inch "enhanced" monocrystal solar panel, the 7-pound Soulra XL has a built-in 2000mAh rechargeable lithium ion battery. The company says it will run for five hours of continuous play (as long as it has some sun to soak up) and has eight speaker drivers and 22W output, which will fill a good-size room or patio space with sound.
Eton's taking preorders on the $300 unit and it looks like it will start shipping in the next 10 days. We'll let you know how it sounds when we get our hands on one.