In an age where smartphones threaten the viability of stand-alone digital cameras, Lytro has sparked interest by promising to revolutionize photography. The so-called light-field camera is a long, rectangular device that can refocus an image even after you take the picture, so you can snap photos and worry about the finer details later. Although Lytro's camera won't be available until next year, it deserves praise now for drumming up excitement in an often nonbuzzworthy category of consumer technology.