A global wealth mashup would help students and people from various countries understand and visualize the disparity in wealth among countries and cities around the world. Often, people recite statistics about the US being in the top X percent in terms of per capita wealth globally- (generally a figure around 1%) with most other countries lagging far behind. Hearing this statistic is compelling, but seeing it would be compelling in a very different way, and would allow for easier comparisons. For educational purposes, I'd love to see a mashup that takes per capita income by country and city (info available from many sources) and 'color codes' that on a Google map or Google earth map. A country view would show the average per capita income by country for comparison globally- (shades of green from darkest green as wealthiest to white for the poorest countries) and then users could zoom in to a country to see how wealth changes across a countries regions and by city. Users could also input 2 country or city pairs to compare two places to each other, adjusted in a specific currency. Why? I think seeing regions with vast swatches of white, and only pinpoints of green, would help people understand the disparity of wealth across regions better than a list of countries and numbers, which are often just listed alphabetically.