There's also a Serial SCSI project in the works
http://www.adaptec.com/worldwide/co...home_appstory_sas&sess=no&language=English+US
Future Bandwidth to Grow Exponentially
Serial Attached SCSI will also deliver more bandwidth: data transfer rates starting at 3 gigabits/second with a roadmap to 12 gigabits/second (1,200 megabytes/second) - nearly four times that of current enterprise technologies. Serial Attached SCSI also delivers full bandwidth to each storage device, allowing IT managers to easily and significantly scale performance.
http://www.adaptec.com/worldwide/co...home_appstory_sas&sess=no&language=English+US