The Samsung F4EG Eco Green is a 3.5-inch HDD with up to 2TB of storage capacity, 3Gbps SATA interface, NCQ, and has a 32MB buffer.
Source: SlashGear
The Samsung 1TB Spinpoint MT2 is a 2.5-inch 12.5mm hard drive packing 333GB per platter and runs at 5400 RPM.
Source: SlashGear
The Toshiba Canvio was designed for Mac OS X backups featuring a USB 2.0 interface and capacities of 500GB, 750GB and 1TB.
Source: Engadget
The Seagate 3TB FreeAgent GoFlex Desk is the first 3TB drive which requires a 64-bit OS and features a FireWire 800 or USB 3.0 interface.
Source: Electronista
The Thermaltake BlacX 5G is a USB 3.0 hard drive docking station with support for up to 2TB hard drives on both OS X and Windows.
Source: CrunchGear
The LaCie Rugged Safe features 128-bit AES hardware encryption, biometric fingerprint access, shock-proof enclosure, capacities of 500GB or 1TB, and USB 2.0 or FireWire 800 connectivity.
Source: Gizmodo
The Silicon Power A70 is a waterproof external hard drive with capacities ranging from 250GB to 640GB. It features USB connectivity and compatibility with Windows, Mac, and Linux.
Source: SlashGear
The Buffalo MiniStation Cobalt USB 3.0 features 25% speed increase over the USB 2.0 version and expected to ship in 500GB and 640GB capacities.
Source: Electronista
The Samsung 500GB S2 is an external hard drive featuring Samsung Auto Backup and SecretZone.
Source: SlashGear
The Buffalo Dualie is a combination hard drive and iPod/iPhone dock. It comes bundled with a 500GB HDD.
Source: Engadget