There are two popular services for p2p -peer to peer lending.

1. Prosper – get more details here

2. Lending Club – Click here to learn more about Lending Club Borrow up to $25, 000. Rates as low as 7.89%. Good credit required.
Lending Club is a social lending network where members lend and borrow money from each other at better rates, bypassing the banks. We have already issued more than $20, 000,000 in loans at better rates than banks’.
Lending Club accepts only US-based credit worthy borrowers with 660+ FICO score and no current delinquencies.