I own this hardrive enclosure:
http://www.misco.co.uk/productinform...0Enclosure.htm
I've had it roughly a year, and for the price you pay for it it works fairly well. I use it with a USB 2.0 connection with an older 120 WD Caviar HD. My two cavats with it: The fan noise is GOD AWFUL loud, almost to the point of a dying cat once in a while. I've heard that putting a drop of WD40 on the fan fixes the problem, so I'm about to attempt that. Also, the plastic covers are a bit flimsy, but hold up well so long as you're not flinging the HD all over the place.
ONE HUGE THING TO NOTE: You cannot boot an OS from it, nor will your BIOS recognize it! I learned this the hard way when my HD died last week (and I'm not sure this is true for all external HDs, but I'm just letting you all know).
Overall, it's...okay. Speeds are quite good on it!
Jam it back in, in the dark.