This is actually rather cool! There has been a movement in some fields towards reproducible research (http://reproducibleresearch.net/). If people were required to provide source code in their publications (by funding agencies), it would be rather useful for those cases where there are questions about the data analysis (for example: http://en.wikipedia.org/wiki/Anil_Potti). It would allow a serious referee to check to see if there were either obvious or subtle mistakes in the analysis. Also, it would allow subsequent researchers to see what previous researchers actually did in the reduction--not just the final figure.