Multimedia+Creation+and+Sharing

VUVOX - online multimedia presentation creator.
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Prezi - online multimedia presentation creator
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Google Docs Presentation
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Zoho Show - presentations can be embedded into blogs and social network pages.
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PreZentit - completely online but currently unsupported. Hopefully I new one will be available soon as this was a fun tool.
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Voice Thread - online multimedia tool for collaboration and critique.
[|VoiceThread]

Online-Convert - converts all file types to other file types...video, audio, etc.
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What NOT to do with PowerPoint..... []