These things are awesome, I just got a few and you can get deals on laptop HDD on eBay so it makes for an affordable on the go storage device capable of 100s of gigs and at a far less price than a thumb drive or flash cards offering similar capacities.
I just picked up this enclosure:
http://www.meritline.com/meritline-u...enclosure.html
I haven't really had time to mess with it yet but from looking at it it seems decently made.