This is a lot more readable and approachable - nice work! Cool to see that the designers managed to stick to the green template while making it work for a bunch of different content types. Thanks for the update!
Mostly I noticed the difference in the Docs. The elements are called out more explicitly and it's easier to find things on the docs, which have considerably less whitespace: https://docs.djangoproject.com/en/1.7/intro/tutorial01/
http://ibin.co/1kret3oW7caZ illustrates whitespace wastage in the blog
Edit: Added an illustration
there is no such thing. Think more whitespace equals more focus around the content and less clutter.