I'm using a web site to see if any of my accounts had been compromised! I've searched by individual email addresses plus domain-wide accounts. So far I've found four breaches: three at adobe and one at linkedin...
The site is Have I Been Pwned? (Link opens in a new window.)
Wikipedia says "Pwn is a leetspeak slang term derived from the verb own, as meaning to appropriate or to conquer to gain ownership. The term implies domination or humiliation of a rival, used primarily in the Internet-based video game culture to taunt an opponent who has just been soundly defeated (e.g., 'You just got pwned!')."
Kudos to Sam Richardson at last night's WordPress Meetup at the Tampa Bay Computer Society. She had found it and shared it with the class.
I plan to make extensive use of the site.