Feature set:

Here is the list of features (existing+new) which are now included.

* Its coded and unit tested to work on Vista and XP SP2 with .Net 3.5. It should work (not tested though) on Server 2008/2003 as they borrow UI code base from Vista/XP. No words for any other OS.
* It runs in background and can be controlled from System Tray.

* It can be configured to:
+ start with Windows.
+ look for wallpapers in multiple folders including/excluding sub-folders. Best results when used with matching resolution wallpapers.
+ change wallpaper once every preferred duration between 1 min and 500 hrs. It will understand "000 Hrs/Mins 000 Min" format. It can interpret M/Min/Mins/Minutes and H/Hr/Hrs/Hour as Minutes and Hours respectively.
+ confirm before changing wallpaper
+ adjust image positioning for odd size wallpapers.

* You can also change wallpaper manually by clicking 'Juggle Now' menu or by double clicking the icon.
* It allows only one instance at a time.
* It also displays the last updated wallpaper and the time stamp when the next change will occur.
* It displays a confirmation dialog before automatically changing wallpaper. Its configurable to show a confirmation dialog and for how long the message should be displayed.

* "Active" option to enable/disable wallpaper juggling while program is running.
* Last changed wallpaper is a clickable menu which opens the wallpaper in windows explorer.
* You can download stunning wallpapers from interfaceLIFT.com using "Download Wallpapers" screen right within juggler.