Dream Manager

From VistaDreams:

Dream Manager is a desktop background manager and switcher for Windows Vista with Startdock's DeskScapes installed. Using Dream Manager you will be able to setup how often you would like you desktop background to change. By managing your dreams through the Dream Manager interface allows you to rate your dreams so that your favorites will show more often, and also allow you to set a different positioning setting for each dream.

Features:

• Support DeskScapes (.dream), DreamScene (.wmv, .mpg), and Wallpapers (.bmp, .jpg, .png)
• Add custom folders to the library. Folders will be watch for new/removed files and updatelist accordingly.
• Thumbnail view for all types
• Change desktop on a timed interval, every day, every restart
• Group items to make organization easier
• Option to group items when switching to get a "theme"
• Disable items or entire groups so they will not get picked.
• Set positioning for a specific item. (i.e. Center, Tile, Crop, Stretch)
• Rate your dreams. Higher rated dreams show up more than lower rated dreams.