As JMan noted, Fedora Unity has developed tools to semi-automatically rebuild the Fedora iso images with the updates, these are released as re-spins and distributed through bittorrent at: http://torrent.fedoraunity.org/
now for the future and why it is so bright:
At the same time, or in response to the work done by Unity, I'm not sure, the Fedora Project itself has undergone huge changes in it's very core design in the process leading up to the release of Fedora 7, which for reasons I'm about to explained won't be a Fedora Core release at all. The Extras and Core projects are to be merged into one project, Fedora. Up untill now there have been Fedora Core, maintained almost exclusively by Red Hat people, and Fedora Extras, with packages maintained by the Fedora community. The separation doesn't really make any sense and feeds into the belief that Extras is some kind of second class citizen, which is not true, the packages in Extras are of higher quality than the packages in Core, one of the reasons for the merge to take place is for core to adopt the quality ensurance of the Extras project.
Anyhow, the resulting Fedora pool of packages will be released to users in various different "spins", composed by using tools similar to the ones developed by Unity. There will be a "Desktop Spin", a "Server Spin", a "KDE Spin" and so forth. The tools developed to make these spins will also make it real easy for people to create their own custom spins, custom as in containing packages from outside of Fedora, like packages for mp3 supports. They will also make the work Unity is currently doing easier, providing high quality re-spins (or revisions) in the future as well as live-cd-spins and more. As alway, the future is bright.
(remember, Fedora is trademarked, you can re-spin something based on Fedora and call it Fedora without permission)