BlueSmoke has published a review of the Trancend 1.8-inch Portable Hard Disk, which weighs as little as 4.1 ounces. The bus-powered USB 2.0 device comes in 20GB and 40GB capacities. Both the 20GB and 40GB versions are available from Transcend's online store for US$202.00 and US$314.00 respectively.
Meanwhile, MobileMag has posted a short write-up on the Apricorn EZ-Bus Mini 1.8-inch mobile hard drive. The USB 2.0 drive weighs five ounces and is also available in 20GB or 40GB versions. It, too, is bus-powered and includes an integrated USB cable that stows away in a recessed compartment in the drive's small enclosure. No pricing or availability information is given.