Earlier this May, Logitech unveiled its Solar Keyboard Folio for the new iPad and iPad 2, and the accessory maker is rounding out the month by adding another sun-powered peripheral to its stable. Like the Keyboard Folio, the just-announced Wireless Solar Keyboard K760 works with iPads, but it's also compatible with Macs and iPhones. The K760 has Bluetooth for pairing up to three devices at a time, and it features Mac-specific keys such as Brightness, Command and Eject. Us