I have signed and released the xen4centos CentOS-6 packages to our main mirrors, the following are released:

x86_64: xen-4.4.3-1.el6.x86_64.rpm xen-devel-4.4.3-1.el6.x86_64.rpm xen-doc-4.4.3-1.el6.x86_64.rpm xen-hypervisor-4.4.3-1.el6.x86_64.rpm xen-libs-4.4.3-1.el6.x86_64.rpm xen-licenses-4.4.3-1.el6.x86_64.rpm xen-ocaml-4.4.3-1.el6.x86_64.rpm xen-ocaml-devel-4.4.3-1.el6.x86_64.rpm xen-runtime-4.4.3-1.el6.x86_64.rpm

src: xen-4.4.3-1.el6.src.rpm