Voicethread is a new open source application that allows you to upload pictures, videos, or powerpoints/slideshows on the web.  What is nice about it, is that you can add audio or text “commentary” on each slide.  If your students or colleagues have voicethread accounts, they too can view your shared “voicethreads” and make comments as well.  Some great applications include:

promote critical thinking by having students comment on specifically chosen photos of historical events in social studies

have foreign language students complete discussion and assessments

upload class lectures and powerpoints for additional reinforcement and help for those that are absent

student projects on a novel, event, or concept.

Here is a very INFORMAL voicethread I made.  Nothing serious, but it shows the basics of the program.