Could you be more precise. If you only want your taskbar to be like centered and not take all the screen space it's already in there. If you want your icons to get bigger and all, I don't know how.
EDIT : http://www.kde-look.org/content/show.php?content=5609
Maybe this could help ?
Actually Altough I haven't tried it, the link I provided seems to provide such a task bar. I have only seen Mac OSX in action for a short time tough, so I don't remember all the specifics of the task bar, but I think that's what he may be looking for.
Well, you can shorten and center the taskbar in the Control Center. Icons can also be made to enlarge when hovered over by having icon zooming selected in the Apearance section in Panel configuration.
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