Plextor has announced the availability of their new ultra-portable DVD-RAM drive, the PX-608U. Here's part of their press release:

Plextor LLC, a leading developer and manufacturer of high-performance digital media equipment, today announced the availability of the PX-608U ultra-portable DVD+/-R/RW CD-R/RW multi-drive. The smallest CD/DVD drive ever to be released by Plextor, the PX-608U measures just 5.43 inches x 6.38 inches x 0.87 inches and weighs less than one pound. The drive is designed for traveling laptop computer users, who can use it as a lightweight, high-capacity, removable storage device.

The PX-608U supports 5X DVD-RAM functionality for removable data storage applications. Unlike other optical media formats, special burning software is not required to write DVD-RAM media on a personal computer. A user simply inserts a blank DVD-RAM disc and the system automatically formats the disc and assigns a drive letter. Users can drag-and-drop files, use the "save as" command, and remove the disc, which can then be read in any PC or desktop player with a drive that supports the DVD-RAM format. The DVD-RAM format offers up to 9.4 GB per double-sided disc.
The PX-608U is expected to ship to distributors in North and South America on September 25 with a suggested retail price of $199.99. More information can be found here.