Western Digital's MyBook VelociRaptor Duo is actually two 1TB 10,000RPM drives in one housing and claims transfer speeds of up to 400MB per second. The two Thunderbolt ports allows the drive to be daisy-chained to additional VelociRaptors, to increase capacity and performance.
The speed and size is typically best put to use on large video-editing projects. But while the 10,000RPM alone is pretty good — though the real world difference between 7200RPM and 10,000RPM isn't thaaaat huge — combining it with Thunderbolt means you've basically got a humongous RAIDable SSD.
For more overkill hard drives, Western Digital has also bumped its pocket-sized USB 3.0 My Passport drives up to 2TB, which will cost $US200. [Western Digital]