If you have been trying out various programs and tweaks to get the Windows 7 taskbar functionality and look in Windows XP, here is one excellent freeware that imitates Windows 7 taskbar in XP.
Into Windows posted transform Vista taskbar into Windows 7 taskbar guide just after the release of Windows 7 build 6801, back in October 2008. The guide was simple and it was very effective since there were no Windows 7 themes available for Vista at that point of time (was the first guide available on the web at that time).
Since then, we posted many guides related to Windows 7 taskbar including get Windows 7 taskbar shuffle feature in XP & Vista which helps you add Windows 7's shuffle taskbar feature to XP & Vista.
ViGlance is an free application for Windows XP (read it as only for XP), which can turn around your Windows XP taskbar into Windows 7 taskbar.
* Replace Windows XP button with 7's start orb.
* Replace old taskbar with superbar
* Adds Windows 7's grouping feature
* Shows larger taskbar icons
* Adds transition effects
This application doesn't take much of system resources and it's also a standalone application that requires no installation.