1 - It is commonly known the ARM cpu's of Apple were faster at performing tasks, using less clocks.
It is the industry who needs to adopt the FLOPS. Unless it does, expect people to rely on Ghz and chip maker's CPU's reputation.
The absence of referencing of the L2/L3 cache along with its value is also very misleading, for as long as Ghz is of leading usage. This will change with Conroe, as I see.
2 - SCSI is popular on high-performance workstations, servers, high-end peripherals, and in the consumer market by use of IEEE1394.
RAID arrays on servers almost always use SCSI hard disks.
Desktop computers and notebooks more typically use the ATA/IDE or the newer SATA interfaces for hard disks, and USB connections for external devices. Lower price. Isn't it what people want?
More on SCSI HERE