I think this is a great idea, but from reading this thread, I don't see why the wiki is a problem.

• Permissions could be changed to only allow certain people to edit
• The main "Maemo school" page could be linked to anywhere
• Adding new videos is as simple as adding a page
• The "discussion" pages in the wiki would allow for giving feedback on videos/asking questions

Having dealt with adding an application to the downloads section, I really don't think it's what you're looking for. It is very specific to downloading applications for a certain platform. Tweaking would need to be done, which makes the wiki the easier option.

I think starting with the wiki would be a good idea, as it is very simple to implement. If the time comes that the wiki gets hard to manage, the videos could be moved over to a different backend in the future.