The Spartan-3A DSP Starter Kit ships with the Intel S33 SPI Flash device.
Should this part be used on new board designs?
No, the Intel S33 SPI Flash device is being discontinued. The official recommendations for new design from Numonyx is to use the M25P device.
The M25P is supported by the iMPACT tools for indirect programming and is one of the officially recommended SPI devices to be used by Xilinx.