Introductory Video about Ubuntu on Ubuntu's main page or a link from the main page.
Great the user and show them the world of Linux and Ubuntu and how they can get stated.
Possible video contents are;
1. History of open source.
2. News clip contents of governments etc.. adopting open source.
3. A hello welcome from the Ubuntu team ;-)
4. A tutorial about the different desktop environments.
5. A windows migration tutorial.
6. Best practices regarding backups, the home folder, file sharing, security etc..
7. Finally acknowledgement to those who made Ubuntu possible like Linus, Ian Murdoch and so on.