This PostLists Extension provides orderby options, conditions and placeholders for the events created with Event Calendar 3 to be used for each post w
WordPress 2.8 and up allow for reasonably simple custom taxonomies, this plugin makes it even simpler, removing the need for you to write any code.
Tags Autolink automatically turns tag names in posts and pages in links to the corresponding tag URLs. Keeps the original words case in text.
Allows to exchange and share post links + thumbnails across WordPress blogs, based on matching tags and categories.
A plugin for WordPress, You can control the tag cloud(include color,font size,number,and so on) of sidebar.
Add sharing buttons to your blog posts for: Facebook, Digg, Twitter, Email, Reddit, StumbleUpon, etc.
TagMeta - Using your tags as meta keywords.
Wordics creates colorful word clouds from the text in your blog. They are summaries of your blog posts in the way search engines would do them.
Set user specific time zones; this is a work in progress.
A plugin that builds a tag cloud using content from one or more blogs or other websites that provide an RSS feed.
Hide posts with certain tags/categories from the public and other authors
Adds a shortcode for internal links to tags, but checks if the tag exists before linking it.
Creates a template tag that generates a link to an RSS feed for any given tag, optionally allows the inclusion of copyright information into RSS feeds
Provides a sidebar widget containing links to posts with a similar set of tags to the current post.
Event Tags is a plugin for wordpress which generates a link to a Last.FM event page from machine-tagged posts.
RSS link for this tag.