All online videos should have some kind of tagging system that allows users to click on a tag and jump right to the part of the video it references. That's just what veotag does and it's pretty cool.
Better yet, the tag menu text will show up in search engines, and clicking on that SERPs result will take the user right to that part of the video. Sweet! User friendly and search engine friendly too. What more could you ask? If you're looking for ways to better optimize video, you've just found one.
Hopefully, this kind of thing will take off. The thumbnail below shows what it looks like, with the clickable descriptive menu of each section of the video on the right.