The documentation stated: "USB pen drive If you cannot boot from the DVD/CD-ROM drive, but you can boot using a USB device, such as a USB pen drive, the following alternative boot method is available: To boot using a USB pen drive, use the dd command to copy the diskboot.img image file from the /images/ directory on the DVD or CD-ROM #1. For example: dd if=diskboot.img of=/dev/sda Your BIOS must support booting from a USB device in order for this boot method to work." The problem is that the file diskboot.img isn't there. (It wasn't in Fedora 10 either.) The README in the /images/ directory talks about it as well.
*** Bug 509014 has been marked as a duplicate of this bug. ***
diskboot.img was indeed removed in Fedora 9: http://docs.fedoraproject.org/release-notes/f9/en_US/sn-Installer.html#sn-Changes-in-Anaconda I've added instructions for using boot.iso to make bootable USB media which will appear shortly in a revised version of the F11 guide -- thanks for the catch.