"Taskbar Iconizer" is a small portable tool which uses the same registry trick to provide iconized taskbar feature in XP and Vista. You just need to download the file, run it and it'll show following window:
Simply click on the right-side image which shows "Windows 7 Type Iconized" and you have done. You'll need to log off or restart the system to take affect.
To restore default settings, click on the left-side image.
