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Engage students with an iPad-specific app called bContext. Simply upload static files (PDF, Powerpoint, images, etc.) and easily transform the doc into interactive slideshows by seamlessly integrating voice/audio and hand-notation tools. Link to your materials in Dropbox, Facebook, LinkedIn, Twitter, Youtube, and Google Drive.
The free version is robust and ideal for the casual user; 100 MB video storage space is included . The Pro version ($41.99/year) includes 2 GB storage plus other options. Uploading a lesson to YouTube costs 99¢.