For those who don't do video editing, you might ask your self, "whats the point?" And I have actually been asked that exact question before... When I work with hours of footage and when I know that I need to publish a 2 minute video for instance, It would be very helpful for me to be able to see my progress and how much more space I have to edit. You can set many many many markers in your Sony Vegas project and it is VERY helpful.