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 Pwnedlist.com tells you if your user name or email address has been revealed in one of the recent hacker attacks on, for instance, Gawker or Sony's gaming division. It is worth knowing, especially if you use the same details to log into a variety of sites. All you have to do is type in your email address or user name into the box on Pwnedlist.com and it will tell you if it has appeared in any of lists of data that have been dumped onto the Internet recently.