To be honest, the mechanics between most PATA drives and SATA drives are pretty similar. It's just that there are more features with SATA drives, such as NCQ (Native Command Queueing) that make the drive a bit faster than their IDE counterparts.
The faster interface that SATA gives you (150MB/s or 300MB/s) only impacts RAID arrays that need it. A single drive will rarely come close to 100MB/s transfer rates and will average usually around 50-55MB/s.
As for ATA133, it was better than ATA100 for pretty much the same reasons. Only RAID configurations used to break the 100MB/s mark, making the extra headroom that ATA133 provided useful in IDE RAID arrays. However, RAID wasn't that popular back then on workstations as much as it was in servers. When SATA was released soon after, it quickly made RAID an attractive (and easy) option for home users. As a result, everyone just kind of forgot the importance of ATA133 and it was quickly shoved to the side.
Maxtor was the only company who really made a push for it. In fact, I don't think you'll find any Western Digital ATA133 drives. I think Seagate was the only other one who made them.
~cdogg
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