Have I been pwned? allows you to search across multiple data breaches to see if your email addresses has been compromised.
Great resource to see if your email address show up in any of the major hacks that have occurred recently.
This are pretty big hacks, LinkedIn, Myspace, Adobe, Tumblr, etc.
Pop over there and see if you need to change your password. You can even sign up to be alerted when your email address get pwned (that’s hacker speak for “owned”)! This service is legit, run by Troy Hunt, a security specialist at Microsoft.