Django's aggregation is a great tool. That said; if I'm a new user who
knows it exists but not how it works, I'll likely pull up the page
about Aggregation (
http://docs.djangoproject.com/en/dev/topics/db/
aggregation/). This page gives an excellent overview, but leaves me
feeling like there is something missing (such as Sum(), etc). I would
propose putting an aggregation function list on that page, rather than
letting the user eventually find the list at the bottom of the
QuerySet page. Or, put a prominent link near the top that suggests
visiting QuerySet docs for a full list of aggregation features. I
think this will get people going on aggregation more quickly.