Today was one of those “Oops. I revealed myself as an Idiot” days as I accidentally committed database.yml (which contained usernames and passwords) to github.
But then I found this script on the net:
http://dound.com/2009/04/git-forever-remove-files-or-folders-from-history/
Git 0 – Orwell 1, but I still have to reset the passwords, just in case.