The digital revolution is great and all, but those suckers snarf energy like the Cookie Monster does plate-sized snacks. The problem's compounded for travelers on the road—paddling the Minnesota Boundary Waters, say—without a two-prong socket or battery merchant in sight. Step up PowerFilm's rollable solar sheet, a mat of thin plastic with a sheath of solar panels that unfurls to 11.5 by 21 inches to gobble up rays. Pair with a charger compatible with rechargeable lithium-ion batteries for brands including Sony, Nikon, Canon, and Olympus, and your wilted battery will be good to go with a few solid hours of solar rehab. Meanwhile, you can keep tooling around on the lake, or join your battery for a siesta. Solar sheet/charger packages are available from Sundance Solar. $170; http://store.sundancesolar.com/sochforliion.html