Should I leave my laptop plugged in??

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I am concerned about my battery.I just purchased this new Studio 15 with a 9 cell battery and I want this battery to last me through work.I will begin in the fall.So I am using the laptop at my desk at home, is it better for me to take the battery out and just use the AC adaptor for power.If so, how often should put the bettery back it to make sure it doesen't die?Or would it be okay if I kept the battery attached and the AC adaptor in at the same time? Would that eventually start reducing the battery life?Any other input you may have about laptops or anything would be appreciated.Thank you!