Check the first Sticky it will list the repo's for you.
http://download.opensuse.org/distrib...ss-inst-source
http://download.opensuse.org/distrib...1/inst-source/
Are for the Installation Sources
protocol - HTTP
server name - packman.iu-bremen.de
Directories - suse/10.0
suse/10.1
protocol - HTTP
- FTP
server name - ftp.gwdg.de
Directories - pub/linux/misc/suser-guru/rpm/10.0
- pub/linux/misc/suser-guru/rpm/10.1
There are some other additional installation sources.
Edit, I would delete what I just wrote, because I re-read what you asked and you asked for "YUM" specific repositories. I believe Packman is YUM. Are you looking for YUM installation source repo's?