Package Management Cheatsheet:
http://nakedape.cc/wiki/PackageManagerCheatsheet∞

DAG Howto - All Enterprise Linux and CentOS Extra Repos
http://dag.wieers.com/rpm/∞

DRIES REPO - FC 1 2 3 4 and RHEL 3 4
http://dries.studentenweb.org/rpm/clientconfig.html∞

LIVNA REPOS - FC 6 7 8
http://rpm.livna.org/rlowiki/∞

Managing software with yum
http://www.centos.org/docs/4/html/yum/∞

Good Link
http://www.mjmwired.net/resources/∞

FRESHRPMS apt repos: Legacy RedHat Releases
http://freshrpms.net/apt/repositories.html∞

http://wiki.centos.org/Repositories/RPMForge∞