There is an Alpha release of BeleniX 0.8 available that can be
installed directly off the package repo via a network installer. There
is no LiveCD release yet, that will come later. The network installer
can be used if you are already using OpenSolaris 2009.xx or BeleniX
0.7.1. It will install 0.8 Alpha into a new boot environment leaving
your current BE untouched. While booting you will get a GRUB menu
option to boot into this environment.

Check this post for more details:

http://moinakg.wordpress.com/2009/08/27/belenix-0-8-alpha-using-network-installer/