Newegg lists 516 SATA cables. Some of the standards are SATA 1 (150Gbs), ans some are SATA 2 (300 Gbs). So I suppose there is a dfifference.
In practice it probably wouldn't matter which cable you chose, since even with a pair of WD Raptors in RAID 0, you would never even approach the SATA 1 spec in terms of data transfer rate.
At present the SATA 2 spec is an urban myth. However this could change should solid state drives become more available.
But, since the prices are close, if not identical, it wouldn't pay to buy SATA 1 cables, because the SATA 2 jobbies would automatically be backwards compatible.
A new motherboard with SATA 2 interface would likewise be supplied with cables that would meet the SATA 2 spec.