I would like to stress here the importance of Nelly Gable's book Drawing the movement. Cutting the type punch. It's simply the most important reference / manual on punchcutting available at the moment and every person interested on the subject should buy his/her copy as soon as possible. In case you don't know, Nelly is the current punchcutter in charge of the cabinet des poinçons at the Imprimerie Nationale in France.
The book is profusely illustrated by Annie Bocel and it was translated from the original French text by type historian James Mosley. A small print run of the English version was produced and chances are it won't be available in the coming years.