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You have Rev. B MBP.

How do you know? I just got this macbook pro like about 2-3 months ago...

see I found this
As of April 2006, there have been five revisions of the MacBook Pro, A-E. Serial numbers of the original begin with W8608.

1. W8608, Rev. A.
2. W8609, Rev. B.
3. W8610, Rev. C.
4. W8611, Rev. D.
5. W8612, Rev. E.

But my serial number doesn't fall under anything!
 
Try using system profiler. I just went into it and found out that my iMac 500mhz DV is technically a PowerMac :D Anyway, it should give you some basic information and one way to find out is to use the serial number and go to apples website. That, I think, will help. Correct me if I am wrong!
 
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