Grab It!   
by Datatrend Software   

Grab It! is a Microsoft Excel based application that digitizes data from pictures. Graphs and charts can have data point values digitized and angle and distance measurements can also be made on photos. Skewed graphs are handled automatically (sometimes scanning isn't perfectly straight) as well as linear, log, date or time charts. Output is displayed in real time and special features for error bar graphs, stock charts, and multiple data sets are included.