From Fedora Project Wiki
S3 bucket names already grabbed
Regarding obtaining bucket names relevant to our needs, note that I have already grabbed the following names and am happy to turn them over to anyone:
fedora-ami, fedora-cloud, fedora-cloud-sig, fedora-hosted, fedora-images, fedora-pvgrub, fedorahosted, fedoraproject, fedoraproject.org, redhat-ami, redhat-images
Also, consistent with Ubuntu's naming convention I've grabbed the same names, using "fedora" instead.