Dedoimedo posted a tutorial about managing Scientific Linux third-party repositories

I've written a very important and useful tutorial explaining how to safely manage Scientific Linux third-party repositories, including enabling them automatically or manually, importing GPG keys, setting repository priority and protection, resolving conflicts, and more. This is a must-read article for any RHEL, CentOS and Fedora users, but Scientific Linux fans get a special treatment. Enjoy.

  How to smartly manage Scientific Linux repositories