Animated user manual would be so great, but hard to use without a table of content type functionality. I'm envisioning a player with a table of content in a sidebar, where the user can jump directly to a section. Inside a section, there are play to next bookmark mode: User watches a short section (like, a bolt goes to a hole), and player pauses automatically. user inserts a bolt in a hole and presses enter. Animation shows a part going to the bolt and a nut fixing the two together, and pauses. User does the same. Etc.
I have no idea if such a format exists, if this needs another program as a wrapper (such as Powerpoint etc), a custom player or what; I'm just drooling about the idea of the result!