This is because xen-3.3 is a new package for Hardy and so it needs a manual review by the archive admins. This is normal.
https://launchpad.net/ubuntu/hardy/+source/xen-3.3/3.3.0-1ubuntu7~hardy1 shows the status. It won't be available until it no longer says 'NEW' in the builds section. -- Please backport Xen 3.3 from Intrepid https://bugs.launchpad.net/bugs/260998 You received this bug notification because you are a member of Ubuntu Backports Testing Team, which is subscribed to Hardy Backports. -- ubuntu-backports mailing list ubuntu-backports@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-backports