[ Thanks to Andrew
Weber for this link. ]
“The primary reason for adding these repositories is that
neither the CentOS repository nor the rpmforge repository contain
the same packages that were available in CentOS 5.x. There is some
serious lag time which will cripple your ability to move to CentOS
6. Therefore, in order to gain access to all of the necessary
packages you will need to add these two repositories.
Unfortunately, this is an unsatisfactory solution as the more
repositories you add the greater the chance you will have package
conflicts. At this point in time however, this cannot be avoided.
In order to minimize the impact of using multiple repositories it
is important to use yum-priorities.”