With the Lulzsec recent post of email addresses and passwords, along with all the regular hacking that occurs on a regular basis, it can be really hard to know if your email password has been compromised. Fortunately, Should I Change My Password can help automatically scan a variety of these info leaks to check if your password has been hacked. This way, you only have to change your password if it actually needs to be updated.
Update: Just to be clear, you don't have to enter your password on the site, just your email.
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Narasimha