WP plugins I use and recommend
Good list of plugins, why they are good etc.
#plugins
Writing a Plugin « WordPress Codex
Writing a Plugin « WordPress Codex
The official document on how to write a plugin for WordPress (single user).
Flash Crop Admin Tool
Perfect for creating custom avatars for a website based on a URL or upload. Select the part you want and crop away.
WP OpenAds WordPress Plugin
Plugin for WordPress to allow integration of OpenAds advertising into feeds etc.
Event Calendar for WordPress
Awesome, really flexible calendar plugin/framework for WordPress