Download iStat Pro here:
http://islayer.com/apps/istatpro/
This is a widget that will run on you dashboard and tell you the stats of your MacBook Pro, including fan speed. I have this on a late 2011 model and the fans are normally around 1000 rpm to 1500 rpm when idling and can go up to 4500 rpm when doing heavy video editing. Tell us what your fan reads under the rpm.
Hope this Helps