I may be mistaken, but I thought those were only available to RHN subscribers, and are not open source or free to redistribute.
The virtio block drivers? Really? I think I remember something about it being leaked...need to check
Nope
http://www.linux-kvm.org/page/WindowsGuestDrivers/Download_Drivers
ah, good. that was a big gap a year or so ago when I was investigating free virtualization for Windows