The book I mention in the video is The Progress Principle: Using Small Wins to Ignite Joy, Engagement, and Creativity at Work by Teresa Amabile and Steven Kramer. (Buy it at Amazon, BN.com, 800CEO, or IndieBound). You can learn more about the research on their web site.
I keep my “Done List” using I Done This, which has a free version for individual users. A simple notebook or journal also does the trick.