This webpage has many links to 1-the centers working on NMR and 2-anything about NMR:

some of the links do not work but the name of the university or institute with the name of the professor is written, so you can find them easily
:
http://hikwww8.fzk.de:8080/imb/bionmr/links_e.html
Sure, it is not complete and updated but it has many centers that had not seen them before .