inittab equivalent in fedora 15?

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http://unix.stackexchange.com – I have just installed Fedora 15 on my laptop. I want to study /etc/inittab as I studied it in RedHat 9. I don't see any script in /etc/inittab. Also , the way the default runlevel can be changed in inittab has changed in Fedora 15. If there is a good tutorial to study the changes in Fedora 15? I found https://fedoraproject.org/wiki/Systemd, but was not much useful. (HowTos)