ASE Labs recently reviewed a new Hard Drive Enclosure that designed for SATA Hard Drive. the Eagle Tech N-Series Pro Serial ATA to USB2 Hard Drive Enclosure is black with gun metal color accents on the sides. Both sides of the unit have a mesh design to allow airflow in since the unit does not have any fan to actively cool the hard drive. Since the entire enclosure is metal, it acts as a giant heatsink and should dissipate heat well. The two sides are held together by four flat head screws.
The only saving grace for this unit is that the price is very cheap. Unfortunately,
ASE Labs don't recommend this one since the problems they encountered outweigh the price benefit. It is the old saying, "you get what you paid for." That's certainly true in this case.
Link: http://www.aselabs.com/