The aggregation is already available in Django SVN version. Now, it’s possible to do things such count authors of all book entries, count comments os all post entries, sum values of all sales to a client and much more.
Here is the official documentation of this feature: http://docs.djangoproject.com/en/dev/topics/db/aggregation/

January 1st, 2011 21:55
I like your design a lot. I’d really like to find out where may I get such layout for my blog?