I just heard a podcast (www.stackingbenjamins.com) about Peer to Peer lending. The podcast was an interview with the guy who runs a website called LendingMemo (www.lendingmemo.com) which explains how Peer to Peer lending works. It's aimed at people who might want to invest in Peer-to-Peer lending and has very detailed info about how to filter for your level of risk, how to diversify, and how to use this as a way to generate decent returns that fit your risk profile.
I thought I would share this info here for anyone who is interested.