GPL is a MAJOR breakthrough for visualizing data. It happens to be in SPSS 14.0, but it is a breakthrough in general, not only for SPSS users. It is a completely different philosophy. I will have more posts on this, but check out this links.
For some neat examples of cool charts many of which one could imitate in GPL see http://www.math.yorku.ca/SCS/Gallery/
For more information on the person who created the concept: http://www.spss.com/research/wilkinson/ Note the Grammar of Graphics. Follow that link.
GPL doesn't have anything to do with Tufte per se, but many folks I have had in class see a synergy. There is no direct link between the two authors. I'll let you decide. http://www.edwardtufte.com/tufte/