If you don't feel like adding a fan, just cutting the sides off of the cover could work well enough. The plastic of the cover is a really great insulator, keeping lots of heat in the drive. You will probably have to modify the cover anyways to attach a fan.
I have a MBWE 1 500GB and it went from 60+C to 54C in an 80F room (sorry for not converting), which is just enough to keep the drive happy.
I removed the cover and cut off both sides where it says "WD" using a dremel cut-off wheel. Make sure to leave just enough of the cover so the alignment tabs towards the front still engage. This way you get good cooling and still have the pretty button. Your warranty will obviously be voided. Private message me if anyone wants a pic. If you have never cut plastic with a dremel before, be sure to practice on something cheaper first.
For the record I added this alias to /root/.bashrc so I can just type 'temp':
alias temp='smartctl -d ata -A /dev/sda | grep Temp | sed "s/^.*\(.[0-9]\)$/\1/" '