Is it OK to leave the power plugged in when the computer is fully charged?

I often have my MacBook Pro on my desk and it's a pain charging it up then running it down all the time. Would it be OK to just leave the power plugged in all the time? Is it bad for the battery or not?
Cheers.

MacBook Pro
https://discussions.apple.com/community/notebooks/macbook_pro
https://discussions.apple.com/community/mac_os
http://www.apple.com/support/macbookpro

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    ****Click the White thumb to say thanks****
    ****Please mark Accept As Solution if it solves your problem****
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