There are several apps for iPods and iPhones dealing with all kinds of quilting information and solutions and they are free. I use three --Quilt.Fab, gives measurements and sizes, etc., QuiltRef - more instructional info, and EasyQuil - mostly about the different supplies used in quilting. I use all three of them for different things quite a bit. Worth looking into. I am waiting for those for my iPad and hope there they will be free also.