ZFS Root in Solaris Express Community Edition - SXCE 90

Solaris Express Community Edition now supports ZFS root. Pick Solaris Express Developer in the grub menu, exit the X gui installer (Ctrl - Alt - Backspace) and use the text mode installer (install-solaris from the console). Now select "ZFS root" :-).

You should now have a default ZFS rpool.

It also supports JumpStart:

http://opensolaris.org/os/community/zfs/boot/zfsbootFAQ/