Apologies, Have not been aware that anything was off topic here whne it came to CentOS, yum, etc. Will try to do better in the future.
It's not that it's off topic, it's more along the lines of "we can't help if there is indeed a problem with that repo". This is why I suggest dag or the rpmforge list. It's their repo, so if there's a bad sig etc, they'll be able to fix it. If it's a case of "you forgot to install the gpg key" they'll point that out as well.
-- Jim Perrin System Architect - UIT Ft Gordon & US Army Signal Center