Drupal Resources

WampServer is an open source project, free to use (GPL licence).

WampServer 2.0e [12/05/08]
Includes :
- Apache 2.2.10
- MySQL 5.1.30
- PHP 5.2.7

Essential but impossible to find guide to developing modules for Drupal.

Loads of resource and code snippets on customising your user profiles.

Great overview of all the changes that you'll need to account for when upgrading your theme from Drupal 5 to Drupal 6.

An essential resource for any Drupal module or theme developer. The site documents all Drupals core module and theme functions.

Recent article on http://sixrevisions.com highlighting some pretty awesome looking Drupal sites.
Nice to see a DrupalSN partners' work in there too, well done ImageXMedia (http://imagexmedia.com)!

Great resource that all developers and users should check out to make sure their Drupal sites are secure.
You'll be surprised how little things could leave your site open to attacks.

Great write up on Drupal which lists various resources around the web that will be useful to everyone.