External Serial ATA Interconnection to Be Single Cable for Data and Power
 

External Serial ATA (eSATA) technology became the first interconnection for hard disk drives after SCSI that not only worked inside a personal computer, but also could connect external storage devices. Unfortunately, nowadays usage of eSATA is less convenient compared to certain USB implementations due to necessity to use two cables: one for power and one for data. But that is going to change once SATA organization decides on the new version of eSATA.

http://www.xbitlabs.com/news/storage...and_Power.html

goodbye firewire!