Jigdo saves you a lot of bandwidth and time if you already have the data (maybe a local mirror or previously released media), and has been
proposed as a feature for Fedora 9.

For documentation on how to use Jigdo or pyJigdo visit:

http://fedorasolved.org/post-install-solutions/jigdo/ (Jigdo)
http://fedorahosted.org/pyjigdo/ (pyJigdo)

To get the bits, either yum install jigdo or yum install pyjigdo, and run it with the following Jigdo file:

http://jigdo.fedoraunity.org/templates/9-Alpha/Fedora-9-Alpha.jigdo

or go to http://spins.fedoraunity.org/spins for more information.