Popularity Contest
Define post view & its popularity to see which of your posts are the most popular.
Breadcrumb Nav XT
Breadcrumb navigations show the visitors path to their current location back to home page.
Option to exclude page from site navigation.
Yet Another Related Posts Plugin
Yet Another Related Posts Plugin (YARPP) gives you a list of posts and/or pages related to the current entry, introducing the reader to other relevant content on your site.
Drag and drop anything anywhere. A web 2.0 plugin
Most Popular Categories By Posts
Most Popular Categories by Posts is a WordPress plugin that allows you to list your blog’s most popular categories based on the number of posts assigned to those categories within a user-configurable time period.
WP-Print
Allow your post to be printed by reader. Under Wordpress Plugins, center column
Dynamic Ajax calendar list upcoming events, normal blog post, WP widgets support.
Welcome Visitor
Welcome-visitor is a wordpress plugin, which will welcome visitors ( who come from others sites, e.g. google search, yahoo! serach or your friends' links), and ask them to bookmark your site or to subscribe your rss feed.
Add Signature
Add any html code to your post and page footers – great for banners, messages or email optin incentives.