No - but I figured it out after looking at this:
so put this in your /tftpboot/pxelinux.cfg/default file:
append initrd=initrd.img ksdevice=eth0 rescue devfs=nomount ramdisk_size=20480 ks=http://<server>/ks/rescue.cfg
and then have this in the ks/rescue.cfg file:
network --bootproto dhcp
url --url http://<server>/<iso location>
w/ FC6 (maybe FC5) i think you can use ksdevice=link which will boot off of the nic w/ a link (so you don't have to worry about the device name)
<iso location> is where ever the Fedora install is mounted/available - you could do this w/ the other methods too i think.