PUBLIC MARKS with tags plugin & admin

a plugin that makes it easy to set up theme options in WordPress. You can easily add uploaders, colorpickers, radio boxes, text inputs, textareas, etc to a panel- and even more advanced stuff like post, tag and page selectors.

Get a tree view of all your pages directly in the admin menu

Easily hide parts of your administration page.

plugin to keep track of what is going on inside your blog. It does this by recording certain actions (such as who logged in and when) and storing this information in the form of a log. Not only that but it records the full contents of posts (and pages) and allows you to restore a post to a previous version at any time.

Enable moderation requests and notifications by email to all administrators.

管理画面のメニューをドロップダウンに変える wordpress2.5対応

管理パネル用のテーマ オリジナルの管理パネルのスタイル、レイアウトはほぼそのままで、フォントサイズを小さく

This plugin allows you to add highly customisable forms to your website that allows non-registered users and/or subscribers (also configurable) to submit posts. The posts are kept in "draft" until an admin can publish them (also configurable).

downsize your post page

show server info on ur dashboard DOES WORK WP 2.1, on WP2.0x use http://nlindblad.org/wordpress/diagnosis

I'm working on Japanese translation....

gives you full control of your Wordpress administration section, without requiring any changes to any files

allows you to assign permissions to specific posts that allow or deny certain users and roles.