During this research, I've found a few interesting FAQs:
Enhanced IDE/Fast-ATA FAQ
http://burks.bton.ac.uk/burks/pcinfo/hardware/atafaq/atafq.htm
A very detailed source of information on the IDE/ATA interface,
including lots of useful tidbits on how to determine what interface
version is on your system, pointers to useful utilities,
troubleshooting advice, etc. In fact, the only thing I fault this
FAQ for is not having a good comparison to SCSI.
SCSI FAQ:
http://www.dtpdirect.com/tips/tips/scsi/comp1.html
http://www.dtpdirect.com/tips/tips/scsi/comp2.html
A bit dated (it proudly mentions that Amigas use SCSI), but still a
good trove of SCSI information.
About SCSI and IDE:
http://www.hardwaregroup.org/faq/scsi_about.htm
A concise compare/contrast of ATA (IDE) vs. SCSI, which examines the
issue of 1 vs. more than one hard disk, and the relative importance of
the controller technology vs. the basic capabilities of the hard disk.
- Jim