Don't want to scaremonger any more than necessary, but if anybody uses the same password for SL as their registered email account, Apez, SL Exchange, SL Boutique or any other related service make sure you also change that immediately.
If the hacker is able to decrypt your information there's a good chance they will try to use that password elsewhere and if they can access your email they will be able to get even more info about you.
Here's a good article on secure password creation:
http://meyerweb.com/eric/thoughts/2005/01/31/password-production/