I found these maps of the cultural demographics of America to be fascinating. The Jews run Las Vegas? Who knew?http://www.valpo.edu/geomet/geo/courses/geo200/HomePage.html
I think it would be cool to have a way to overlay the different maps to see the correlations between things like religion and education, politics and income, etc. I wonder if I could do a mashup using a graphics package in a web app. Hmmm.