Google Public Data Visualizer

Google Public Data Visualizer is a free way to analyze public data.  You can look at fertility rate, life expectancy, HIV prevalence,  education, etc for many countries all at once.  You pick what you want to plot on what axis.  You can animate the graph through the century by moving a slider to see how things change over time.  To see this website click here.   This might work well in your Data Analysis class or Statistics unit.  This might work in your Geography class if you want to look at GDP versus Population Density, etc.  Play around with it to see what you can find out.