For those that play any of Blizzard Entertainments games, IE Diablo III, Starcraft or World of Warcraft please read the below:
Players and Friends,
Even when you are in the business of fun, not every week ends up being fun. This week, our security team found an unauthorized and illegal access into our internal network here at Blizzard. We quickly took steps to close off this access and began working with law enforcement and security experts to investigate what happened.
Please read the rest of the article from their CEO here.
Additional information is here.
In another point, this has been well handled unlike the Sony scheme last year, the passwords are cryptographically scrambled which is somewhat ambiguous but it also means they weren't held in plain-text which is good.