Linden Labs has sent out a note saying that the Second Life Database Server has been hacked using a "zero-day" exploit. I am not sure exactly what that means, but I think overall that their disclosure of the problem and notification of their users is nearly a perfect example of responsible corporate communication.
In posts to their blog as well as emails to their users, they describe the problem, how they discovered it, the actions they have taken to mitigate the effect, and the actions that they either require or recommend of their users in order to protect themselves from potentially compromised data.
qv: Official Linden Blog
Tags: SecondLife, LindenLabs, Security, Hacked