We've just launched our own interactive magazine reader for the iPad that incorporates video, social networking and other interactive features - it's called MAGapp.
As part of the reader, you can download a free copy of Engage ME, a title that focuses on custom publishing and branded content. You can also purchase a copy of Social Media 101, a beginner's guide to getting started and using Facebook, Twitter and LinkedIn, for just $0.99.
You can download MAGapp, for free, here: http://itunes.apple.com/us/app/magapp-pro/id448151593?ls=1&mt=8
In closing, would love to hear to what the techies on this forum think about MAGapp.