How do I tell if my i7 MBP is using the Intel HD or Nvidia 330?

Can someone please tell me where can I identify if my MBP i7 is using the Intel and or the Nvidia?
I know that the system is supposedly delegating these actions from one to another, but I am trying to monitor my battery life as it appears to be running a tad short from what Apple is stating is feasible.
Any assistance would be greatly appreciated.
Thanks.

Some info here that will help http://www.markc.me.uk/MarkC/Blog/Entries/2010/4/21Early_2010_Macbook_Pro_-_Battery_LifePoor.html

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