I have started using Redhat from 5.0, and I like every Redhat and it’s subsequent Fedora release.

Fedora 8 (Werewolf) (2007)
GNOME 2.20 : eog provide “Open with…”

Fedora 7 (Moonshine) (2007)
Firefox 2 : Inline spell checking
KVM + virt-manager + virsh
all hard disk become /dev/sd* due to libata driver

Fedora Core 6 (Zod) (2006)
Compiz + AIGLX
Xorg 7.1
GNOME 2.16

Fedora Core 5 (Bordeaux) (2006)
GNOME 2.14
OpenOffice 2.0.2
Xen Virtualization

Fedora Core 4 (Stentz) (2005)
Yum-based Package Tools
Fedora Extras packages are available
GNOME 2.10

Fedora Core 3 (Heidelberg) (2004)
GNOME 2.8 & Xorg 6.8.1
Kernel 2.6.9
GCC 3.4

Fedora Core 2 (Tettnang) (2004)
Kernel 2.6
GNOME 2.6 & Xorg 6.7
SELinux

Fedora Core 1 (Yarrow) (2003)

Redhat 9.0 (Shrike) (2003)
glibc 2.3.2 with NPTL support
kernel 2.4.20 with NPTL support
GNOME 2.2

Redhat 8.0 (Psyche) (2002)
GNOME 2
OpenOffice.org 1.0.1
gcc 3.2

Redhat 7.3 (Valhalla) (2002)

Redhat 7.2 (Enigma) (2001)
ext3 become the default filesystem
Grub replaces LILO as default boot manager
GNOME 1.4

Redhat 7.1 (Seawolf) (2001)
kernel 2.4
simultaneously support all supported languages, including CJK
Mozilla

Redhat 7.0 (Guinness) (2000)
glibc 2.2
gcc 2.96 caused a flame war

Redhat 6.2 (Zoot) (2000)
ship ISO images for FTP download

Redhat 6.1 (Cartman) (1999)
graphical installer (anaconda)

Redhat 6.0 (Hedwig) (1999)
GNOME integrated
kernel 2.2
glibc 2.1

Redhat 5.2 (Apollo) (1998)

Redhat 5.1 (Manhattan) (1998)
linuxconf as a centralized configuration tool
Netscape browser

Redhat 5.0 (Hurricane) (1997)
All I remember is it is hard to use.