I wrote a custom tag that allows you to cache an expression in a template.
I noticed, that my template was sending many duplicate queries to the database because I was using a method in my model that used a foreign key in a loop with many repeats. I could have recoded the view to generate all the required data before rendering the template, but chose to implement a caching mechanism for the template instead. There seem to be pros and cons to both approaches. More details here: http://django.satilla.com/board/topic/2/
