Grist says, "A kick-ass bicycle" (10 Green Gadgets)

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Bike Friday
This kick-ass bicycle doesn't just fold up for easy storage and transport; it's also a respectable touring bike. Use it for everything from multi-sport adventures (think bike-kayak-bike trips) to business travel. The only downside: Bike Fridays, like other foldables, are significantly pricier than your average commuter bike -- but they're also significantly cooler.

(Read a first-hand account from a Bike Friday tester.)