The three things I hope you will remember on Monday after my talk are:
Prerequisites: You need to know what's a link, a manifold, a graph, and an integral. You don't need to know anything deep about these, though, and in particular, you don't need to know anything about Feynman diagrams. In fact, if you've never seen Feynman diagrams before and you are curious, today's your chance!
This abstract is at http://www.math.toronto.edu/~drorbn/Talks/UMD-991029/. You may also be interested in the talk I'm giving at Johns Hopkins two days earlier, "The Harish-Chandra-Duflo Isomorphism is as Easy as 1+1=2". See http://www.math.toronto.edu/~drorbn/Talks/JHU-991027/.