In Windows 7, frequently used programs can be pinned to the taskbar
(hence called Superbar). Likewise, DockBarX, a Gnome panel plugin, can
be added to Ubuntu to achieve almost the same effect to pin and unpin or
launch the applications from the panel.
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Go to Ubuntu Software Center > Edit > Software Source.
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Select "Other Software" and click "Add"
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At APT line, enter ppa:dockbar-main/ppa, click "Add Source" and "Close"
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At the left panel of Ubuntu Software Center, select "PPA for Dockbar Main Group", which is added after the above steps
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At the right panel, select DockbarX and click "Install"
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Wait for the cache to be updated, then right click the panel and click “Add to Panel”.
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Select the DockBarX Applet and click "Add".
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A
thumbnail preview of a running program is also available to DockBarX.
To enable this feature, right-click the DockBarX item on the panel,
select Properties, choose Window List and tick "Show Previews". Other
preferences such as appearance, window item and group button can also be
configured by users.
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Ubuntu Panel