Confidential information collected by online sites

-- Health sites offer tools used by medical pros and consumers to track data, including test results from HIV or cancer exams--hot stuff for insurers or drugmakers.

-- Online children's sites collect kids' names, ages, and toy preferences--a potential gold mine for marketers who target young consumers.

-- E-tailers collect credit card, social security, and bank account numbers, along with profiles of what you buy or view--juicy information for everyone from identity thieves to retailers.