When I was starting with python & web2py, the video series made by codeschool.org really jump started it all for me ... beside reading the book !
I suggest to read the first 5 chapters of the book to get familiar with the basic concepts before watching the videos .. and after watching the videos, go through the whole book again ! ... it all came together for me .. then practice with some coding example before you start developing your own ! here is the video series link on youtube : http://www.youtube.com/watch?v=zmSOnKkm8Y0&feature=bf_prev&list=PL5E2E223FE3777851

