Google Video: Link to specific points in a video
Despite some other things that Google has done in the past, they are still make a lot of useful tools. The latest one I came across might be really good for allowing people to discuss videos posted to the hub.
The Google Video "Permalink" allows you to create a link to a specific point in the video. The article in Make you go hmm provides some good examples on how it works.
Using the "Outlawed" piece on Google video I've linked to 7minutes, 2 seconds into the video where Binyam is quoted about why he chose to go to Britain rather than the US.