All 7200 drives run fairly warm.. hehe but try a SCSI 10K or 15K drive.. very toasty.
I see they have fans that lie flat over the drive now to cool it off, as well as separaters between your drives as well.
I'm actually interested in finding something fairly good to cool drives too.. heh maybe I'll try water cooling, I see they have one that will cool the cpu as well as a drive or so.