More than 5 million passwords of Google accounts has been leaked few days back on the Russian Bitcoin Security forum. Check if your account details were leaked.

The website states:

If you don't like to specify your full email address for any reason, you can replace up to 3 characters with asterisk sign (e.g., for myaccount@gmail.com enter myac***nt@gmail.com), thus we'll show you a count of matches for this pattern.
Was your Google account password leaked in last few days? Check here at isleaked.com.

However @rick_farrow tweeted to us:

That link was removed from other sites as people believed it was harvesting emails.Most vaild PW/email combos are very dated.
So use your discretion.

Might be a good idea to change your GMail passwords, in any case!