• Official Python
  Tutorial
• Dive Into Python - Excellent cross-training developers moving from another language to Python
• Language Reference
• Python Libraries - Documentation for all the built-in modules provided in Python
• Python Style Guide - Make your code look like everyone else's python code (it's a good thing)

• Official Django Documentation
• Django Book (Definitive Guide to Django at Amazon.com)

• Mercurial Web Site
• Mercurial - The Definitive Guide

• Getting Started (uses the "webapp" framework - we'll be using Django in our samples)
• Using 
  Third Party Libraries (including Django) on App Engine

Client Debugging

• Chrome Browser - Fastest browser with very good client-side debugging tools.
• Firebug - The best overall client debugging experience - as FireFox Add On.