There were many changes made to Fedora 15, one of the ones that I keep running into is how to change the default run-level of your box.  I use Fedora as a server OS in many situations because it offers some advanced features which CentOS either has out of date or doesn’t even include.  Since often these boxes run headless I just set them to boot to run-level 3.  The command below tells you how to do it:

ln -s /lib/systemd/system/<target name>.target /etc/systemd/system/default.target