I like the look of it and must have one! Looks from the piccies that there is a sliding cover that protects the interface when there're not drives "inserted" (Darwin smirks chlidlishly...). Like Chris, I can really appreciate that this kind of interface will make swapping HD's around for backups and data access much more convenient. Begs two questions though, how does one store the drives when not in use and, following from some other comments in this thread, how long will one have to wait for a drive to cool down?!
I like the idea of the drive being air cooled like this - I have numerous 2.5" drives that I attach via USB enclosure. I've had three of them develop tics (you know that annoying grinding clicking sound) and faults from being left attached to my notebook on warm and humid days...