I recently downloaded Tableau Public's software (they have a private version as well) and I'd like to take the time to present my first visualization. 

This is Vancouver's postal codes displaying the median donation in the sizing of the bar chart and the average donor age by colour. Note that downtown Vancouver (V6B) has young donors who don't give much and that young is 40. No surprises that there's a correlation between age and average giving. 

More visualization to come.