Many of our sites are already running on Drupal 7 and we are in the process of upgrading those on Drupal 6. This article describes the differences that editors will see between the two systems. Here is a list of the sites already on Drupal 7:
Differences affecting all sites
The editing interface now has a button for creating video shortcodes. This will create the video shortcode that you would need to do by hand in Drupal 6.