OpenSolaris still only comes as a Live CD and can't be installed without a GUI, at least AFAIK. Well, I managed to boot the CD into cmdline mode, then started sshd to be able to login from a remote box - only to start the GUI installation again via X11 forwarding :-\
So, here are a few things I did to start a minimal OpenSolaris system and a few other things I always have to look for after another installation procedure - yes, the memory upgrade for my brain is already ordered.

$ svcadm disable gdm ppd-cache-update desktop-mime-cache mime-types-cache ogl-select \
                 gconf-cache input-method-cache pixbuf-loaders-installer fc-cache \
                 icon-cache pkg/update stosreg dbus hal autofs dns/multicast intrd \
                 rmvolmgr avahi-bridge-dsd name-service-cache routing/ndp
$ cat /etc/hostname.xnf0 /etc/defaultrouter /etc/nodename
192.168.10.12
192.168.10.1
foo
$ svcadm disable svc:/network/physical:nwam
$ svcadm enable svc:/network/physical:nwam
$ cp /etc/nsswitch.dns /etc/nsswitch.conf
$ cat /etc/inet/ntp.conf 
server de.pool.ntp.org
server europe.pool.ntp.org
server 2.pool.ntp.org
$ svcadm enable svc:/network/ntp
$ rolemod -K type=normal root

Now booting takes only 105 seconds on this box - heh, we just saved 5 seconds! :-)

$ grep -v ^\# /rpool/boot/grub/menu.lst 
timeout 30
default 0
title opensolaris
findroot (pool_rpool,0,a)
bootfs rpool/ROOT/opensolaris
kernel$ /platform/i86pc/kernel/$ISADIR/unix -B $ZFS-BOOTFS,console=tty -v
module$ /platform/i86pc/$ISADIR/boot_archive

$ cat ~/.bash_profile 
export HISTSIZE=9000
export HISTTIMEFORMAT='%F %T '
export GREP_OPTIONS='--color=tty'
export EDITOR=vi
export PAGER=less

alias la='ls -lah'
alias locate='slocate'

Oh, and as a bonus, although totally unrelated to this article: check out this package manger cheatsheet - how often I have needed that ("How do I do 'dpkg -S' with RPM? Or pkg?"). Thanks, nakedape!