muzik

There is already several Categories Widget in WordPress Plugins Database,such as Breukie’s Categories Widget.But when I upgrade my site to WordPress2.8,it doesn’t work any more.So I wrote this.It displays your categories using the wp_list_categories/wp_dropdown_categories function, utilizes parameters for this function.You can set up one or more this widget in your sidebar(s).
<a href="http://phonedelta.com/" rel="nofollow ugc">Live Demo</a>

Alpha’s Categories Widget

Enhanced Categories Widget,Compatible up to WordPress 2.8.

blueinstyle

This is just a small WordPress plugin that lists the most popular categories by post count in a widget. Includes several options.
Useful for blogs with many categories and just want to list the most popular.
For Themes that do not support Widgets, you can now put this code anywhere in your template:
 
Support and Feature requests are on my forums at http://justmyecho.com/forums/

Most Popular Categories

Display your most popular categories in a widget

Alpha’s Categories Widget vs Most Popular Categories