I see a couple of Bret Victor videos here, but the one I loved the most was "The Future of Programming":
https://vimeo.com/71278954
Really set me on a path of re-examining older ideas (and research papers), for applications that are much more contemporary. Absolute stunner of a talk (and the whole 70's gag was really great).
"What would be really sad is if in 40 years we were still writing code in procedures in text files" :(