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Explain Everything ($2.99) is an easy-to-use lecture capture and screencasting option for the iPad (and Android devices). An add-on (the Explain Everything Compressor for Mac, $14.99) lets users project content directly from a Mac. The accompanying Explain Everything Player is free. Helpful movies and tutorials are available from the publisher's web site.
Here are some helpful links:
Explain Everything description:
Compress Everything description: