Motorola so had this down pat last year, but we suppose O2 is just showcasing its pedal-powered charging system now that such devices are all the rage. Just days after we had a look at two unorthodox chargers from Orange, along comes rival O2 with a bicycle-related alternative. Reportedly, the eco-friendly device will be demonstrated at the O2 Wireless Festival in London's Hyde Park, but unfortunately, each of the demo bikes will be stationary. Still no word on whether O2 has a mind to take this thing commercial, but for cyclists the world over, here's to hoping it does.

[Thanks, Adam]

There's a big difference between "smallest" and "small enough," but SAIT and Samsung SDI might've just crossed the gap with their new joint-developed fuel cell mobile charger. The device, which the companies claim is the world's smallest fuel cell charger yet, can pump 2W of juice, and supposedly charges mobile devices in 1/5 the time of competing offerings. At 5.3 ounces, and measuring a mere 5mm thick, it shouldn't be much of a problem at all to slip this into your bag, letting you extend the life of your PDA, phone, camera or PMP. In tests the charger has completed 200 continuous charges, and is nearly ready for market -- with over 120 patents involved in making this thing tick. The unit is based on small user-replaceable methanol cartridges, providing "limitless" power if you're willing to spring for enough fuel cartridges. There's no exact word on when these things will hit retail shelves, but Samsung expects chargers like this, along with fuel cell-based laptop batteries to be commonplace in 2-3 years.

[Thanks, Mike]