Nice. I've always liked cable-powered USB drives for ease of use and transporting.
My one grip is that it's 500GB. At ~30MB/s, that means hours of transferring. Bring on the powered eSATA! Makes me wonder why the specs for it didn't call for powered operation from the get-go. I believe we would be seeing a lot more drives using it.
If anything, it may have sparked a quicker USB 3.0 adoption.