Cincom: Why do you need CPQ?
A simple self explanatory video showing the value of CPQ for someone with no background in the area.
Novus CPQ: CPQ Overview
Novus CPQ is an independent CPQ adviser, and this is their CPQ overview.
Tacton: Solving Sudoku using Tacton Configurator
Tacton shows the value of a constraint based configuration engine. This specific demo is a CAD integration, but the same technology is used for CPQ as well.