Q: I'd like to boost my course to make more relevant to technology my students use (like iPhone or iPad). What platform would be a most modern one with the less challenging learning curve?

A: I would recommend iTunes U app. It gives you access to enormous resources and makes it easy to manage. You can build your course in it in private/public format. It is not an LMS. It has been designed to enhance students/instructor interactions in the flipped classroom or online setting. More