[root@install ~]# rpm -qa|grep -i VirtualBox
VirtualBox-3.1-3.1.8_61349_rhel5-1
[root@install ~]# yum --showduplicates list VirtualBox-3.1
Loaded plugins: dellsysid, fastestmirror
Loading mirror speeds from cached hostfile
 * addons: mirror.atlanticmetro.net
 * base: mirror.atlanticmetro.net
 * dell-community: linux.dell.com
 * epel: serverbeach1.fedoraproject.org
 * extras: mirror.sanctuaryhost.com
 * updates: mirror.ubiquityservers.com
Installed Packages
VirtualBox-3.1.x86_64               3.1.8_61349_rhel5-1               installed
Available Packages
VirtualBox-3.1.x86_64               3.1.6_59338_rhel5-1               virtualbox
VirtualBox-3.1.x86_64               3.1.8_61349_rhel5-1               virtualbox