The interests should/could be mapped with their semantic relationships, and with the size of node representing numbers of participants with that specific interest. Nodes could be zoomed in and out. (Zooming in to the most detailed level would reveal usernames of participants listing that interest, and if we're dreaming - hotlinks to their presence on the web - blogs, twitter, fb, linkedIn, etc.)
This would be helpful for a number of reasons:
1) finding a subgroup with similar interests/emphasis in this MOOC
2) viewing the breadth and proportions of interests represented by LAK participants
3) It would be most enlightening to see how (or if?) this interest/emphasis map evolved over time. An animation of such would be very insightful, especially if somehow it could be tracked before and after LAK11 in Banff, to measure impact the course, and then the conference had on interests.