This is a great example of a video based e learning, it's created in storyline and uses some branching and custom menus. It's amazing what can be made with some cameras, lights, mics, creativity and acting talent.
This is a nice little Health care eLearning example, there's a mix of content and tests. It looks dated to some extent but sometimes simple is good.
This academic paper looks at message design for mobile learning. A great little read it is from 2011 but still has value.