A cool tool, one that might come in handy during workshops/lessons when you want all the participants to easily navigate to several websites. ShareTabs allows you to list several URLs, personalize a single link and then create a single web page with thumbnails of the collected sites and easy-to-navigate tabs across the top.
The interface is pretty simple to use. I easily copied a few URLs and created a page of streaming video sites: http://sharetabs.com/?streamingvideo.