Desktop Enhancer
SmallAndHandy Desktop Enhancer is an innovative Desktop add-in designed to make your work more comfortable and productive. Minimize windows to tray, make them semi-transparent, hide applications quickly by hotkey, edit list of folders that appears on the left side of the Open and Save dialogs in...
http://www.SmallAndHandy.com/_downloads/DesktopEnhancer.msi - 307Kb - Download - Screenshot

IntegryDESK
IntegryDesk is an OS enhancer to help you organize your desktop for efficient working. You will be able to save/restore the icon layout, hide/show all desktop items or move them to cascading popup menus. Also, you will be able to access any files, folders, programs, URLs and even send emails in... Enhanced window navigation will let you minimize applications to the tray, roll them up/down, put on top, make them semi-transparent and more.
http://www.integrydesk.com/download/idesk.zip - 1Mb - Download - Screenshot

3DNA Desktop
3DNA is a 3D desktop enhancer that improves the way you work with Windows and the Web. You can choose from different 3D Add-on Worlds to explore and customize with 100's of themes and skies for an immersive and entertaining desktop. 3DNA works by overlaying the wallpaper area and easily lets you... Once you have selected the World you like, you can download additional user-created themes and skies or create your own to share. ... The interface is intuitive, and there's an optional Tutorial World that walks you through the product.
http://3dna.fileburst.com/d3DNA_Loft_110.exe - 16Mb - Download - Screenshot

BoostXP
When it comes to optimization suites and Windows tweakers, the one-stop shopping approach has emerged as the standard. Offering a number of tools to modify the Windows user interface and boost performance, BoostXP does exactly what its name implies. The neatly organized interface is loaded with... Included with the usual fare of desktop properties settings are a handful of performance enhancers such as a registry cleaner, a memory optimizer, an uninstaller, a start-up manager and more. ... For example, you can make the Windows taskbar transparent, tweak several types of desktop settings,...
http://down1.systweak.com/boostxp.exe - 3Mb - Download - Screenshot