11. Pricegeek is a new service which gives you an instant snapshot of the current market value of any product, based on a deep trawl of the eBay auction site. What makes this service special, though, is the attention to detail and the amount of useful information it delivers. (via The Red Ferret)
Mark J. Perry is concurrently a scholar at AEI and a professor of economics and finance at the University of Michigan's Flint campus. He is best known as the creator and editor of the popular economics blog Carpe Diem. At AEI, Perry writes about economic and financial issues for American.com and the AEIdeas blog.