Please test:

ArchLinuxARM-N900-2013.02-rootfs.tar.gz
ftp://bokmal.de/arch-n900/ArchLinuxA...-rootfs.tar.gz
http://www45.zippyshare.com/v/91278544/file.html

Installation:
- Untar to a partition (ext2/3/4) of your choice.
- Configure U-Boot to load /boot/uImage from that partition.
- Reboot

So, no need to chroot, install anything or edit anything, just untar, sync, boot, network up (wifi-menu), configure, use.

If you boot to Maemo frequently, you may see some devices failing when booting to Alarm afterwards. If this happens, do systemctl poweroff and boot again.

Any feedback is welcome from the brave souls testing