The following CONTRIB for SL 303 x86_64 are now available from:
ftp://ftp.scientificlinux.org/linux/scientific/303/x86_64/contrib/RPMS/

systemutils/yum-2.0.7-8.SL.noarch.rpm
systemutils/README.yum.207-8

xfs/kernel-2.4.21-20.0.1.EL.XFS.ia32e.rpm
xfs/kernel-2.4.21-20.0.1.EL.XFS.x86_64.rpm
xfs/kernel-doc-2.4.21-20.0.1.EL.XFS.x86_64.rpm
xfs/kernel-module-openafs-2.4.21-20.0.1.EL.XFS-1.2.11-15.9.SL.x86_64.rpm
xfs/kernel-module-openafs-2.4.21-20.0.1.EL.XFSsmp-1.2.11-15.9.SL.x86_64.rpm
xfs/kernel-module-xfs-2.4.21-20.0.1.EL.XFS-1.3.3-1.SL.x86_64.rpm
xfs/kernel-module-xfs-2.4.21-20.0.1.EL.XFSsmp-1.3.3-1.SL.x86_64.rpm
xfs/kernel-smp-2.4.21-20.0.1.EL.XFS.x86_64.rpm
xfs/kernel-smp-unsupported-2.4.21-20.0.1.EL.XFS.x86_64.rpm
xfs/kernel-source-2.4.21-20.0.1.EL.XFS.x86_64.rpm
xfs/kernel-unsupported-2.4.21-20.0.1.EL.XFS.ia32e.rpm
xfs/kernel-unsupported-2.4.21-20.0.1.EL.XFS.x86_64.rpm
xfs/README.xfs
xfs/README.xfs.2421-20.0.1

-Connie
-Jarek