Hi Angela, we've been doing a great deal of work along these lines for Cisco Systems' Entrepreneur Institute, as well as others, using the Flexpage course format (which is designed for presenting content rich structured learning paths within Moodle).
We also have an adaptive feature that we're adding in to Flexpage that will enable a 'choose your learning path', 'learning path based on learning style', etc.
You can see a guest only demo (without the discussions, quizzes, etc.) of this kind of course here:
Feel free to contact me if you would like a more in depth demonstration (contact info in my profile).
Comparisons and advocacy
Moodle self-paced learning demos
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