Fedora 17, where to put stuff I used to have in inittab

The daemontools package adds this line to inittab so that svscan will *always* be running:
SV:123456:respawn:/command/svscanboot

I've used this with earlier versions of Fedora with great success. Since inittab is no longer used, where should I start the script from?

Any thoughts are much appreciated.

Paul