The LastPass Password Manager Software Team has issued a warning that the LastPass database may have been hacked. The LastPass team noticed a large amount of traffic leaving the server and could not find out the root cause of the large traffic surge. LastPass is a pretty popular password manager. You can read the LastPass blog post on it here: LastPast Blog Post
One thing I would like to say is I am glad the LastPass team is quickly taking action on this. Unlike some companies that wait to confirm the hack before they take action the LastPass team acted and are forcing everyone to change their master password. With the recent data-losses (Sony PSN, SOE) I highly recommend people keep working on making strong passwords. Also make sure you inform any friends you have using LastPass about changing their password.