08-18-2006 19:05
As posted to the Official Linden Blog:

We're aware of a situation affecting several Residents in which their accounts were accessed unwantedly, resulting in suspicious inworld and forum account behavior. We're investigating and are already working with them to remedy the situation.
For your security, do NOT give out your Second Life password to anyone or to anything! If an object in Second Life asks you to provide a password, make up a new one. Do not provide it with your Second Life password.
This is a basic, general security issue, and isn't specific to Second Life.

Read this page for more computer security tips.
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