Arch installation media, as the last release (2010.05) is not only quite outdated, but now yields broken installations if you do a netinstall (because the old installer is not aware of the changed kernel/initramfs filename in our new Linux 3.0 packages).
What has changed in this period of more than a year?
AIF (installation tool):
Experimental support for btrfs and nilfs2.
Support syslinux bootloader, as well as grub.
Changes to configuration formats to support new rc.conf and linux3.0
Make selecting source more flexible (multiple local and/or remote repos)
Show package descriptions when installing packages
Run with debugging and logging enabled by default, add /arch/report-issues script
Make automatic profiles switch source depending on whether core or netinstall system is running
Remove support for tcp_wrappers in accordance to Arch Linux policy
libui.sh (bash UI framework):
Made long checklists much easier in CLI mode, by using $EDITOR
More flexible initialization
Archiso (image builds):
Snapshot of current core, including kernel 3.0.3-1, pacman 3.5.4-3, glibc 2.14-4, mkinitcpio 0.7.2-1, initscripts 2011.07.3-1 and netcfg 2.6.7-1
Big overhaul: use dm-snapshot instead of aufs2
All needed files to boot for custom USB media installed on /arch
Allow changing NBD export name
Allow using serial console (kernel parameter: console)
Katalog 
