In December 2012, the multiplayer online battle arena game known as Heroes of Newerth was hacked and over 8 million accounts extracted from the system. The compromised data included usernames, email addresses and passwords.
On the news:
https://www.reddit.com/r/HeroesofNewerth/comments/14zj2p/i_am_the_guy_who_hacked_hon/
Download: (Mirrors)
http://scadonsak.com/3mRs/Heroes_of_Newerth_Database_leaked_December_2012.rar