In this and other respect GIS lies at the edge of science, in the grey area between the precise, objective scientific thinking and the vague, subjective world of human discourse. It brings enormous potential benefits in its ability to engage with the general public and with decision-makers, but at the same time presents risks in misuse and misinterpretation. In some domains, such as surveying, the historical response has been professionalism (…) but to date efforts to professionalize GIS practice have been unsuccessful, in part because the use of GIS in scientific research requires openness, rather than restriction.
— GIS and Spatial Data Analysis: Converging Perspectives. Michael F. Goodchild and Robert P. Haining. Papers in Regional Sciences, Vol. 83, No. 1. (October, 2004). pp. 363-385.
Neogeography, and closed source GIS applications (which are extremely popular), are interesting and provocative challenges for the future of Geographic Information Systems (GIS). Count me in for the fun.