Silverstone SST-FP53 HDD Cooler
 

Components in your computer need proper cooling-- I'm sure you know that. CPUs, video cards, cases, hard drives all need to be cooled well, but in my opinion, hard drive cooling is the most important. If a CPU dies, you can get it replaced under warranty or at worst, go buy a new one-- but a failed hard drive could mean weeks of downtime, and most importantly, losing all your precious data.

Link: http://www.fastlanehw.com/reviews.php?i=150