I found several older passwords with my login up on a file-sharing website not so long ago. Luckily I didn't suffer the same fate as the writer's wife.
Also, I believe that google should have 'paid support' in place for this type of situation. No doubt it would be profitable for them, and would save many people quite a lot of pain.
And there it was, in cleartext, on the second page of the search results, along with the username that I used on battlefield heroes beta.
It was on a pastebin with another 60k combinations of usernames and passwords.
The password was only 6 characters in size though (along with every other on that pastebin), so I guess that made it a certainty that it would get cracked.
The problem with this is that your password could end up in your web history and autocomplete. The other option would be an incognito session, but I think that could still lead to it ending up on Google Suggest if you do it often enough.
By regularly, I mean about once a month.