The Scientific Linux Fermi release notes are considered additive. This means that the one set of release notes, is meant to be added to the set below it. So the S.L. Fermi notes, are of the changes Fermi did to Scientific Linux. The Scientific Linux notes, are changes that Scientific Linux did to the vendor's release. And the vendors update release notes are the changes that they did to the original release.
i386
SLF 4.4 Release Notes
SL 4.4 Release Notes
Vendor Update 4 Release Notes
x86_64
SLF 4.4 Release Notes
SL 4.4 Release Notes
Vendor Update 4 Release Notes
i386
There was no SLF 4.3 i386 release, and hense, no release notes
SL 4.3 Release Notes
Vendor Update 3 Release Notes
x86_64
There was no SLF 4.3 x86_64 release, and hense, no release notes
SL 4.3 Release Notes
Vendor Update 3 Release Notes
i386
SLF 4.2 Release Notes
SL 4.2 Release Notes
Vendor Update 2 Release Notes
x86_64
SLF 4.2 Release Notes
SL 4.2 Release Notes
Vendor Update 2 Release Notes
i386
SLF 4.1 Release Notes
SL 4.1 Release Notes
Vendor Update 1 Release Notes
x86_64
There was no SLF 4.1 x86_64 release, and hense, no release notes
SL 4.1 Release Notes
Vendor Update 1 Release Notes
i386
SL 4.0 Release Notes
Vendor Release Notes
README-x86-en
x86_64
SL 4.0 Release Notes
Vendor Release Notes
README-x86_64-en