KoolDock 

A kool dock for KDE. It attemps to resemble the Mac OSX dock.
Features: App Launcher, On Screen text display (over icons), 
Drag&Drop app list, Auto-Hide, Nice hide-show animation, Transparency, 
Xinerama support, Others.

KoolDock is based upon the work of Dang Viet Dung, KSmoothDock 2.1.
For the latest release of ksmoothdock, please visit 

http://www.kde-look.org/content/show.php?content=6585