I always use post it notes but don't depend on the stickiness...also use a straight pin to hold them in place. I lable the row and the position: 1A, 1B, 1C, 1D, 2A, 2B, 2C, 2D, etc...and I always put them in the same position on each block...in my case I always use upper right hand corner...this tells me row and position in row, as well as how to orient it. I always position well away from the seam. It works well...saw this on some of the quilt shows but don't remember which.