Heh. I've been on the CC list for #489376 for quite some time. Actually, I had all but completely forgotten about it. I stumbled into it today, when browsing through Red Hat's bugzilla, searching for information about some other problems, and I clicked on a link that I had clicked a thousand times. It was a link to the Red Hat 5.4 KVM documentation. And whaddayaknow: even though the bug report is still marked as RELEASE_PENDING and even though the WHQL page at linux-kvm.org still lists a couple of zip-files, the drivers are already in what is called the Windows Server Catalog. So, what are you waiting for? Go test them!
Problem is, I have no idea whatsoever, on how to download them :-) Maybe I should touch a Windows box every now and then.