EON is for an audience seeking an easy to use, rock solid (ZFS), no nonsense storage solution utilizing hardware you already own. It is a small live image OS built on Opensolaris that will help transform a system (optimal: 1Gb or more RAM) that can support 3 or more hard disks into a reliable home storage solution for all your digital data and memories.
The ideal install is a USB drive, IDE-CF adapter or Disk on Module. The live CD ISO is mostly for demonstration and testing purposes because of the read only nature. It also serves as an installation point to a USB, IDE-CF (compact flash) media or hard disk where changes and customizations can be preserved beyond reboots.
Note, with a hard disk install you give up the advantage of being one hard drive's worth of power consumption greener and you re-introduce the failure points associated with hard disks. A USB, CF or Disk on Module install is greener and just as efficient.