Michael Sattler's teaching material
The website of EMBL's Sattler Group contains links to a range of teaching materials:
http://www.embl-heidelberg.de/nmr/sattler/teaching/index.html
There's a lot of useful stuff on their website, but it's pretty difficult to navigate.
The website also has links to some of Claudia Muhle-Goll's biomolecular NMR lectures (PowerPoint):
Lecture 1: Phenomenon of NMR - why do we observe a signal?
Lecture 4: Labelling techniques and heteronuclear backbone assignment
Lecture 5: Product operator formalism