How to make my fans slow down?

Basically my 2009 MacBook Pro has got 8GB of RAM and even so, when I’ve just got iTunes, Chrome, Skype and Mail open (and no calls are being made from Skype and nothing heavy is running in Chrome) the fans will be spinning at like 6000rpm which makes a lot of noise and the computer gets really warm.

Usually when all of the above mentioned programs are running I’ve still got between 2.5 to 3.2 GB of RAM free so I don’t know what I can do to make it go quieter other than shutting down programs and going easy on the computer