ActiveState's Python Cookbook was aggregated from the Python developer community, and published as a book by O'Reilly & Associates. 1088 recipes are available for perusal online.

According to the site, the 2nd edition will be published this March. O'Reilly will be publishing a new edition of the Pocket Reference sometime this month. I'm hoping the other major Python books all get updates early this year, not so much for language differences between Python 2.3 and 2.4 as for an updated source of Python best practices.