LaZagne – An open source application used to retrieve lots of passwords
github.com
github.com
Then go sprinkle them around the SFBA.
Its true that the first failure can be used to mitigate some of the visible harm of the second, but any place that features a coincidence of the two failures really should be taken as a particularly strong sign that, in that place, passwords of the type used are entirely the wrong tool for the job.
Still ongoing research in terms of impersonation and other attacks, but quite interesting.