Here's a video of the first 20 minutes of the talk. The (still buggy) ToyLisp code is on GitHub.
Parser Combinators and Interpreters in Scala (partial) from Yuvi Masory on Vimeo.
I discovered a couple of things giving this talk. (1) Covering parsing and evaluation in a one-hour talk is impossible, and (2) it's damn hard to write code on the fly!