By far, the one tip that’s revolutionized my Django projects is this post by Rob Hudson, Django and Relativity:
Nathan Ostgard wrote a post on how to use Django with Gmail and I come back to it all the time:
James Bennett’s django-contact-form is indispensable and I use it all the time in the kind of sites I build at work. Mostly brochureware and conversion forms and what not, but its super-extensible so I can do all sorts of neat stuff just building off his base form class.
Do you have any Django applications, tips, snippets, or indispensable projects you use all the time? Please share in the comments! I love hearing about new stuff :)