well its a waste, it really is, because do HDs reach 100/133mb a second? No!, which is what normal ATA controllers are capable of offering, its only when hard drives start pulling 100MB/s+ speeds which they dont, more like 60mbs write speeds, why bother with stupid SATA drives which cost more and offer nothing in the way of performance, as for 10.000rpm Raptor drives, there a waste too, buy 2x120gb WD's and RAID them and u have urself a raptor drive ass kicker and massive storage space.
i have 3x120gb HD's one being a Maxtor Series 9, one IBM deskstar 180GXP and finally a WD1200JB Special Edition, all of them can come in Sata variations, but cost more and offer 0 performance gains.
all in all sata = waste of time and money, untill hds can use the type of controller speeds they offer.