A recent NY Times article[1] talked about just this. On auction sites like ebay, competitors can lock that accounts of those they're bidding against in order t

A recent NY Times article[1] talked about just this. On auction sites like ebay, competitors can lock that accounts of those they're bidding against in order to win auctions. 1. http://www.nytimes.com/2010/01/21/technology/21password.html http://www.nytimes.com/2010/01/21/technology/21password.html