Plugins
Custom Widgets
This plugin enables you to select which widgets appear on specific posts, pages, categories, author's posts and tag pages. »
A guide to develop plugins for Wordpress
WordPress Plug-in Development (Beginner's Guide) focuses on teaching you all aspects of modern WordPress development. »
Wordpress 2.8 tricks and hacks
An interesting list by 1stWebDesigner of tricks and hacks with new 2.8 Wordpress version. »
An useful plugin: Broken Link Checker
A very useful plugin to check broken links in posts, pages, blogroll and (optionally) custom fields. »
Keyword plugins breaking image captions
A common problem with autolink plugins is they break the image captions when finding a keyword in the description. »
Updating Wordpress through Subversion
A plugin by Sunfox called Wordpress "Svn Update" which quickly updates WordPress to the last version. »