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Speaking presentations- a FREE application. Grab it.
You can create videos with your presentations: just add your explanations and/or notes to your slides, generate the video-then share via gmail, drive, dropbox, box, or via your chromebook, or use their iOS or Android app, or share via their Google Chrome app.
Check them out at: http://www.movenote.com/
Tutorials (Movenote lite is free for teachers/classrooms):
Give it a try!