I lack the patience to wait around for the sun to charge my gadgets, but for $14 Nokero's single AA solar charger looks like the easiest way to ensure you've always got a backup battery ready for remotes and flashlights.
The design is as simple as it gets. You just slap a AA in the compartment in the back, and then set it out in the sun. In just a couple of hours you're promised a freshly charged battery.
Since they recommend direct sunlight for best results (instead of filtered through a window) the Nokero C110 is also weatherproof, so it should be able to shrug off a downpour or flurry. And it even comes with an 800mAh NiMH battery, sweetening the deal. [Nokero via core77]