These examples are documented in several blog entries:

problem1.py 
http://ivanidris.net/wordpress/index.php/2012/01/07/numpy-project-euler-problem-1

problem2.py 
http://ivanidris.net/wordpress/index.php/2012/01/12/numpy-project-euler-problem-2

problem3.py 
http://ivanidris.net/wordpress/index.php/2012/01/19/numpy-project-euler-problem-3

problem4.py 
http://ivanidris.net/wordpress/index.php/2012/01/25/numpy-project-euler-problem-4

problem5.py 
http://ivanidris.net/wordpress/index.php/2012/02/01/numpy-project-euler-problem-5

problem6.py 
http://ivanidris.net/wordpress/index.php/2012/02/05/numpy-project-euler-problem-6

problem7.py 
http://ivanidris.net/wordpress/index.php/2012/02/11/numpy-project-euler-problem-7

problem8.py 
http://ivanidris.net/wordpress/index.php/2012/02/18/numpy-project-euler-problem-8

problem9.py
http://ivanidris.net/wordpress/index.php/2012/02/27/numpy-project-euler-problem-9