Just a couple more thoughts: One thing that can also be problematic in setting up a topics course by unit/area of study is that it can become really huge and unwieldy. I've tried using the glossary as a place to house resources instead of using a ton of resource links on the main page, but the glossary can be tricky to copy from one year to the next with entries in it. The database or book modules would also be options. The point is, you want to try to keep your topic as small as possible (within reason) so that participants don't have to scroll down forever and ever to get to their appropriate topic. Hope that makes sense.
Best of luck,
Teaching with Moodle
Two or three tracks / options in one course
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