WinHider
WinHider is an advanced manager of windows on your desktop. WinHider will give you information, hide, disable any window or UI element like static texts, buttons, edit boxes and child windows you don't want to look at.
RefreshEm
You may have noticed that sometimes the Desktop and Windows Explorer start to display the wrong Icons for some file types. Running RefreshEm when they do repairs the Windows Icon Cache so that the proper ones are immediately displayed.
T5
T5 is an innovative program that changes your Desktop and/or Toolbar Wallpaper automatically at intervals of every Hour, Day, Week or Month.
Aston
Aston completely replaces the standard Windows Desktop. It contains all main Windows Desktop elements (Desktop, TaskBar, Tray, Main Menu, DDE, Drag&Drop) but is much more functional and includes additional features, animated icons, etc
IBDesk
Nice software which enables multiple desktops in Windows. Desktop switching is done via tray popup menu or customized hot keys. Provides different display settings and separate autorun lists for each desktop. Widens workspace, increases productivity.