The updated dreams (which are all dynamic) are getting updates to support multiple monitors on XP.
Additionally some of them have new features.
Winter Snow now handles multiple monitors on Vista better too, making the snow build up on the bottom of the screen on the second screen rather than where the taskbar was on the first.
Expanding Shapes now allows you to set a custom background colour.
Photo Dream now has a static wallpaper mode where wallpapers do not move and just cross fade on changes.
