Andreas Hecht

Creates a new and simple to use widget that adds a tabbed sidebar box with recent posts, last comments, categories, popular posts, a tag cloud and the archives to the sidebar. No Options. This widget is perfect for light-colored themes.
To use the widget, go to Appearance -> Widgets and add “AH Sidebar Box” widget.

AH Sidebar Box

This widget adds a tabbed sidebar box with recent posts, last comments, categories, popular posts, a tag cloud and the archives to the sidebar.

D'Arcy Norman

The plugin gives users the oportunity to embed a tag cloud for a site within any page. 
When using the shortcode [tagcloud] when 
writing in the content of any page, the user includes in the page, a 
tag cloud for posts on that site.
I am working on adding the ability to set options, such as sizes, etc…

AH Sidebar Box vs Tag Cloud Shortcode