Just go change your password.
Again.
http://www.cnn.com/2012/07/12/tech/web/yahoo-users-hacked/
Again.
Hackers posted online what they say is login information for more than 450,000 Yahoo users.
The hack, which of course was conducted anonymously, was meant to be a warning, according to the Web page where the documents were dumped.
http://www.cnn.com/2012/07/12/tech/web/yahoo-users-hacked/