Widget Manager manages your widgets. Not really. Actually YOU manage your widgets via your widgets sub-tab. What this lets you do is copy the widget config from a blog you pick as your "mother blog" to any and all other blogs. Useful if you want the same, or basically the same widget selection on all your blogs is the thing. Like, copy the "mother" config over to a new blog, then do minor tweaks to make the new blog be exactly what it needs to be.
Using this plugin you can add the AddThis (http://www.addthis.com/) sharing bar to the contents of your site and let your visitors share them to their preferred social networks and websites.
Using this plugin you can display the Shareaholic sharing bar into the contents of your site and let your visitors share them to their preferred social networks and websites.
This plugin is supported by the current release but needs some fixes
The Captcha Image Plugin allows you to use Captcha images for comments and user registration, as a measure against automatic spam attacks.
This plugin will automatically make a table of contents for a post by looking for the h1 to h6 tags in its content.