Recently there have been a lot of hacker groups attacking sites and compromising passwords. You should always change your passwords often, but how do you know if you might have had your information leaked?
Should I change my passoword? is a free webapp that will check your e-mail address against several databases of leaked information. It’s not foolproof, but it is definitely worth checking out.
On the same vein of this whole information releasing it’s always a good idea to follow these rules:
Passwords – Change often
Use 9 characters at least
Use letters, numbers, and shift characters
use phrases and words not easily associated with your life.