Collaborating Asynchronously with Voicethread

Finally got around to working a little more with Voicethread. What I like about this desktop sharing application is that, well yeah, it's free! But it allows everyone to collaborate asynchronously. For example, after I create an account, I can upload a PowerPoint presentation, add narration AND/OR make text or audio comments on the content. Then comes the best part, I invite others to participate by adding their voice or text comments to the presentation. It's worth checking out. http://voicethread.com/#home