Leo's pgRouting : a Crash Course video made it thru great. Better than mine. Leo doesn't believe in slides, so this is all live demo stuff. The data he used in the video is part of our code/data download for pgRouting: A Practical Guide.
Another pgRouting related talk, was a case-study of New York City DOT use of pgRouting: Open Source Street Routing With PgRouting For Local Government - Dynamic Data and Performance (video). This one really peaked my interest because he compares pgRouting with ValHalla routing, Graphhopper, and why they chose pgRouting over these. It gives you a sense of where the strengths of each open source product lies. The related slides can be found at FOSS4GNA 2016 Talk Page: Open Source Street Routing With PgRouting For Local Government - Dynamic Data and Performance