The tabs you see on this site in the sidebar were created using code snippet from this location. I then decided that I should write a plugin that adds this as a widget. So I did and submitted it to WordPress plugin directory.
This plugin needs WordPress Popular Posts plugin installed and activated to display popular posts.
You can download and install the plugin using FTP or install from with in your WordPress admin area. Go to Plugins » Add New search for jquery tabber widget. Install and activate the plugin.
Changing Style Sheet:
You can change the colors, width, and other elements by editing the plugin stylesheet
tabber-style.css file located in the plugin directory.
If you are using this plugin, please let me know by leaving a comment below.