You Tube give us the opportunity to deep-link to a specific part of a video by adding minute and second parameters to the end of the video URL.
Here is an example on how to do it:
The original video URL is like http://www.youtube.com/watch?v=5GK0aQrCDEo
We add “#t=1m33s” to the end of the URL like:
The content of the video will be displayed starting after 1 minute and 33 seconds. Good isn’t it? Linking to a specific part of a video is possible by this way which I believe is very useful. See how Matt Cutts tells about Youtube Deep-linking.