Tabbed Widgets Plugin for WordPress
Download Tabbed Widgets from WordPress Extend or install it through Plugins › Add New. Compatible with WordPress 2.8 and later.
With Tabbed Widgets you can create tab and accordion type widgets without writing a single line of code. Simply select the widgets you want to appear as tabs, specify their tab titles and a new tabbed widget is created automatically which you can then place in any of the widgetized areas. Release post »
Screenshot of Tabbed Widgets Settings

Tabbed Widgets Settings