Just installed one machine and did yum update. /usr/bin/opennode binary went missing. The package opennode remained installed, removed that and tried to reinstall, but apparently opennode.repo file went missing as well.
[root@sun yum.repos.d]# ls
CentOS-Base.repo CentOS-Media.repo epel.repo mirrors-rpmforge rpmforge.repo
yum.log contains among other things
Dec 28 06:10:33 Updated: 10:centos-release-5-5.el5.centos.x86_64
Could this have influenced anything?