Just a note to rawhide users who don't update every day: if you missed
the upgrade to rpm-4.6.0-8.fc11, you now cannot read many (and soon
all) packages in rawhide, including the current version of the rpm
package. I believe there was a two day window to do this, so if you
haven't updated since Tuesday you might be stuck.
To get going again, visit koji and manually download the -8 packages
for your arch, update them manually, and then let yum update you the
rest of the way.
http://koji.fedoraproject.org/koji/buildinfo?buildID=83804