Yet, I wanted a free online tool that was more accessible to teachers and students. I was thrilled to come across gCensus today. It is powered by Google Earth (which I finally downloaded today, too) and it is exactly what I wanted.
Simply put, gCensus allows you to use 2000 Census data to construct maps. Google Maps allows you to include/overlay various features such as locations of schools, highways, businesses, and the like. To get started, just click (as indicated) on the "please click here" link on the gCensus homepage. Then select a state, county, and the data you want mapped. Below is a simple map that depicts the concentration of African Americans in Cook County, IL.