SEO Smart Links: Linking to a word manually was really a hassle until I found this one. I also found Crosslinker but wasn't able to make it work.

Post-Ideas: I've been looking for this kind of plugin for a long time so this is really the number one plugin for me. It is even compatible with Wordpress Mu (for Mu version 2.6 you can even upload it in wp-content/mu-plugins but not for Mu version 2.3) .

Our Todo List: Manage your Wordpress Tasks inside your Admin Panel ! Not compatible with Wordpress 2.6 :(

Page-Links-To: This is my second Most Wanted Plugin. Unfortunately it isn't updated for the lastest versions of Wordpress so I replaced it with redirect-to-page, a page template not a plugin.

Page Link Manager: This one is used to hide Pages which you do not want to show up on your Pages Navigation bar.

FAQ-Tastic: This one allows to create a FAQ (see How To Create a FAQ)

WP-SNAP or AZIndex: One or the other allows to create a Glossary (see How To Create a Glossary).

Advanced Category Excluder: This one is usefull for example to exclude the Glossary Category (see How to exclude a category from the Front Page).

Microkid Related Posts: This plugin is a must as it lets you search and then select related posts so that you have full control on it. Not compatible with Wordpress mu 2.3.1.

Plugin Installer: This plugin is really a Time Saver !

Wordpress Database Backup: it does what it says !

WordPress Admin Bar and Admin Management extended: Be more productive with these two plugins!

SyntaxHighlighter: this is a must-have for coder.