Who is Epsilon and Why Do They Have my Data?

From CNET News.com:

If you didn't get an e-mail warning this week that your name and e-mail address were part of a database that was breached consider yourself lucky, and unique. E-mails from dozens of companies--including Citibank, Chase, Capital One, American Express, Walgreens, Target, TiVo, TD Ameritrade, and Ritz Carlton--began flooding inboxes this week after a company called Epsilon announced that its system had been breached. Some people have reported receiving as many as four of these warnings.

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