Wired.com currently has a very interesting series of articles up on the world or criminal carders (individuals who steal, sell, and use credit card and identify information of others). Largely, the articles are interesting because they provide a fascinating look into a world that most law abiding citizens don't even know exists. However, they also provide some helpful advice for businesses seeking to reduce their vulnerability (e.g., when information is changed on an on-line account, have a substantial waiting period before the assets in the account can be withdrawn).

Bottom line: an interesting read for anyone who uses or issues credit cards.