Tray It! by Igor Nys

TrayIt! allows to save precious Taskbar space for minimized windows. For each application which applies TrayIt! it creates a small icon in the System Tray. (System Tray area is located near the Clock). When application's window is minimized this icon represents the application on the Taskbar instead of the regular "minimized rectangle".

Get it from there http://www.teamcti.com/trayit/trayit.htm