If you are worried about the forces of darkness (aka hackers, phishers, purveyors of malware, contrivers of viruses) accessing your bank account, hijacking your Facebook profile or logging into a host of services under your name, this website offers an interesting service. It has compiled a database of hacked email addresses and if you type in your email address it will cross-reference it against the records (without storing your email address). A negative result provides no assurance that your passwords have not been compromised, but if you do show up, then you know it is time to start making changes.