Thanks to David for pointing out this new feature at Prosper.  These API’s provide download of detailed data on statistical information at the site.  This is a very positive thing, and will encourage Groups as well as external sites to provide value added analysis. 

• Build graphs and trends of listing rates
• Use bidding patterns to determine the best lending strategies
• Compare groups using your own research # Create a loan portfolio analysis tool
• Monitor changes to the marketplace over time
• Explore our dynamic marketplace offline using your own tools

Source: Tools – Prosper

While this sounds technical, in reality it is fundamental for social network development.  Kudo’s to Prosper.