I recently read about Flowgram on one of the many blogs I follow and have put it to use for an online class I teach. Flowgram is a tutorial application that allows you to share and highlight websites, photos, videos and static text documents. You can add audio comments and callouts as well in order to draw attention to certain content or provide guidance. In addition, you can highlight text and add sticky note type comments to each element you add. The tutorials are interactive in that if you are sharing a webpage the user can scroll around the page as they listen to your audio comments and even click on different links on the page. Check out the Flowgram I created for my class below.
You may also want to watch the introduction video on the Flowgram homepage to learn more about this cool tool.