A break-in and computer theft last month in an office of TransUnion credit monitoring service has <A HREF="http://news.zdnet.com/2100-1009_22-5942424.html?tag=zdnn.alert">left 3,600 consumers at risk of ID theft.</A> The theft of the computer, from a California office of TransUnion, marks the latest case of consumer information being put at risk following the heist of a PC. The PC in this instance contained sensitive personal information, including Social Security numbers. Security experts warn that the type of information that can be extracted from such computers often is used as the "keys to the vault," which enable the thieves to engage in other illicit behavior. TransUnion said it does not believe any fraudulent activity has occurred since the PC heist, and noted that the computer required a password to access the data.