I just now compiled and installed with patch-nv-1.0-9625-xen.txt on the 9742 beta.
I'm not sure if all the bits are working properly but I'm Mozillaing under it now.
The 9625-xenrt patch also applies cleanly although I haven't compiled and run it.
I'm running a Fedora 6 standard xen kernel.
EDIT: All seems to be working properly. Compiz is very pretty, but entirely incompatible with my City of Villains - such is life
The two patches (thanks to JaXXoN) I've mentioned above are at:
Others may work as well - they just happened to be the ones I had on hand at the time, and since it's working I'm going to leave them be.