Combinatorial proof of the Wheeling thm, aka diagrammatic Duflo iso. Partly an exposition of some of Alekseev-Meinrenken work on the topic.
Lectures on AM proof of KV using Kontsevich theorem
for mathematicians, "rigorous" construction of a perturbative QFT from a Lagrangian.
From AMS notices, with nice pictures.
Video : story drawn on a Möbius strip.