The following FASTBUGS have been uploaded to

http://ftp.scientificlinux.org/linux/scientific/5x/i386/updates/fastbugs/
http://ftp.scientificlinux.org/linux/scientific/5x/x86_64/updates/fastbugs/

i386:
libvirt-0.8.2-29.el5_9.1.i386.rpm
libvirt-devel-0.8.2-29.el5_9.1.i386.rpm
libvirt-python-0.8.2-29.el5_9.1.i386.rpm
libxml2-2.6.26-2.1.21.el5_9.2.i386.rpm
libxml2-devel-2.6.26-2.1.21.el5_9.2.i386.rpm
libxml2-python-2.6.26-2.1.21.el5_9.2.i386.rpm

x86_64:
libvirt-0.8.2-29.el5_9.1.i386.rpm
libvirt-0.8.2-29.el5_9.1.x86_64.rpm
libvirt-devel-0.8.2-29.el5_9.1.i386.rpm
libvirt-devel-0.8.2-29.el5_9.1.x86_64.rpm
libvirt-python-0.8.2-29.el5_9.1.x86_64.rpm
libxml2-2.6.26-2.1.21.el5_9.2.i386.rpm
libxml2-2.6.26-2.1.21.el5_9.2.x86_64.rpm
libxml2-devel-2.6.26-2.1.21.el5_9.2.i386.rpm
libxml2-devel-2.6.26-2.1.21.el5_9.2.x86_64.rpm
libxml2-python-2.6.26-2.1.21.el5_9.2.x86_64.rpm