Based on Harald Hoyer’s great tutorial on boot time optimization for Fedora 17, here’s a list of services I usually disable on my Fedora 17 boxes:

cd /lib/systemd/system
for i in abrt* auditd* sendmail* sm-client* firstboot* ip6tables* fedora*storage* plymouth-*.* lvm2-monitor.* mdmonitor*.*;
do
  systemctl mask $i
done
for i in livesys livesys-late spice-vdagentd ; do sudo chkconfig $i off;done

This is just a memory hook for myself. YMMV and of course what’s expendable depends on the configuration you use on your box.

For an explanation of the systemctl mask command have a look at Lennart Poettering’s systemd tutorial or the systemctl manpage.