The CoolRunner-II Starter Kit has a mini-USB interface which is useful for running various demonstration designs.The drivers for this interface are not included with the Xilinx ISE software tools.
These drivers are part of the ADEPT/ADEPT2 software package available fromthe Digilent website:
http://digilentinc.com/Products/Detail.cfm?NavPath=2,66,828&Prod=ADEPT2