[ubuntu] Pin programs to taskbar?

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http://ubuntuforums.org – So Windows 7 has this handy feature when you can pin programs to the taskbar and modify their order. ie. it would be common to pin most used applications to the left so you always know where your firefox is etc. when you open up many programs and your taskbar becomes cramped. Is there any notion of this in ubuntu 12.04? It's not a big deal but it's not as efficient as Win7 when you have to spend time looking through all your active applications to reopen a window for a particular application. (Hardware)