Googles official line;
This is old data collected by phishing etc and that our systems have not been compromised. The leak is a file which contains information on English-, Russian-, and Spanish-speaking users of Google services, such as Gmail and Google Plus.
According to this blog
http://www.dailydot.com/crime/google-gmail-5-million-passwords-leaked/ 5 million gmail accounts may have been leaked. It also contains a link to check if your account is one of them (if you trust its kosher).
Most visitors to this site know and practice the following advice (don't we
).
Remember the longer a password is in use the greater the potential for malicious compromise. Change it regularly (or at least once a year) and don't use the same credentials for all websites you register with.
These days you have to assume that at least one of your passwords is sitting around in a hacker database.
