First every thing X related seems to be broken in rawhide. This seems to have some thing to do with the wrong version of X being available and none of the supporting packages actually checking the dependencies. I have spent hours and hours manually down grading both my Nvidia and AMD machines. I run the open source drivers and the blobs will be worse. I wouldn't expect them to work for quite a while in Rawhide. Down grading X to F15 or F16 not numbered x.90 should get you running again.
Second Rawhide (currently F16) is strictly development right now and has no updates available at all. If your fedora repos are still enabled and it is looking for fedora F16 repos it won't find them. So if you are running rawhide consider disabling your fedora update repositories. This is really a bug in yum. The whole thing shouldn't crater just because a repository is empty.
If disabling those repositories doesn't work for you, you can always try looking in Koji.