Useful graph digitising software

DigitizeIt is useful for those times when someone gives you a print out of a graph, you want to compare data from a published plot to your own or you work for an oil company and your data is from the 70s. This is much quicker and easier than reading off values and plotting them yourself, just define the axes and get clicking, then copy data out or make an ascii. It's shareware, not freeware, so the licence is £44.