The RailsConf keynote that started it all: http://www.confreaks.com/videos/3315-railsconf-keynote-writi...
David's thoughts in blog post form: http://david.heinemeierhansson.com/2014/tdd-is-dead-long-liv...
A response from Kent Beck https://www.facebook.com/notes/kent-beck/rip-tdd/75084019494...
This should be a great discussion.