This came out about a month ago, must have missed it. From the g3data site : "g3data is used for extracting data from graphs. In publications graphs often are included, but the actual data is missing. g3data makes the extracting process much easier." Very, very slick, and while it's a niche application there will likely be a moment each of you will need this upon encountering a frustrated researcher on deadline at the reference desk. Reminds me of registering datapoints on old maps using GIS.