Collaboration Tool
VoiceThread defines itself as "a collaborative, multimedia slide show that holds images, documents, and videos and allows people to navigate slides and leave comments in 5 ways - using voice (with a mic or telephone), text, audio file, or video (via a webcam) " Slide shows created on VoiceThread can be shared with others. In addition, viewers can be invited to comment on slideshows. the free account allows you to create up to 5 VoiceThreads.
Examples of VoiceThreads

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VoiceThread Simply SpeakingA quick video introduction to what VoiceThread can do.
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If You Lived Near Chernobyl, Would You Stay?An example of VoiceThread in action.