EZWebPlayer Video Plugin allows you to post your videos, report on views, track which videos have been posted and where, and has a simple toolbar plugin that allows you to add videos quickly.
Hikari Featured Comments is a simple plugin that adds 3 new custom fields to comments, allowing you to add special properties to each of them.
Post Gallery Widget is a rotating gallery widget using a custom post type for gallery content.
swfObject Reloaded allows easy embedding of swf files and better media management for swf files, allowing swf files to have a height, width, and their own minimum flash version.
Disqus Comment System replaces your WordPress comment system with your comments hosted and powered by Disqus.
eShop is an accessible shopping cart plugin.
Membership allows you to transform your WordPress site into a fully functional membership site. (Disclaimer: Incsub is a sponsor of Weblog Tools Collection.)
Register Plus Redux enhances the user registration process with complete customization and additional administration options.
Ultimate Taxonomy Manager is an easy to use taxonomy manager to customize taxonomies and custom fields with a great user interface.