The Solio, from Better Energy Systems is marketed as a 'green' product which will power your ipod/mobile/pda/gsp/psp etc.
Unfortunately, the truth isn't quite as impressive as the hype. The Solio requires 8 hours of strong, uninterrupted sunlight to charge up fully.
When I plugged my PDA into my fully charged Solio, the power drained away within 20 minutes. I then had one dead Solio, no sunlight, and a rather dissappointed feeling. The unit can be charged up via a mains adapter, and used as a back up battery, which is okay if you have mains power available but what's green and eco friendly about that? My verdict? Looks great but it doesn't really do what it says on the tin.