This is a windows taskbar replacement software that add some new functionality present in Windows 7 to older Microsoft operating systems like Vista and XP
It adds almost all functionality of Windows 7 taskbar back to XP and Vista!
Features that SBar add are:
1. Grouping taskbar buttons in the way Windows 7 do it.
2. Thumbnail previews for all opened windows. (in XP static - live in Vista)
3. Jump lists with pin support
4. Aditional tasks in jump lists
5. Pin support to taskbar (experimental)
6. Support to Skype 4.x and Firefox 3.x
Thumbnail preview sample: