Ideally you'll want to do some full on video production. If you want to do it for cheap, you can use: - Free Screen cast tools to record your desktop or just t

Ideally you'll want to do some full on video production. If you want to do it for cheap, you can use: - Free Screen cast tools to record your desktop or just the app window. - Use some audio capturing tool to record your voice over. Best if you have a mic and can control the eq. I think quicktime Pro does has support for this too. ($30 for pro). - Use imovie to edit/animate transitions between your script. Hows that for a starts?