Good-to-have Yum Repositories
 

Do you have some good-to-have yum repositories to recommend to me? Thanks.

I'm using RHEL5.

livna.org
 

It depends on any specific needs. Most often the default repositories are enough, though it is handy to have livna.org repositories enabled for getting video player and codec related stuff updated.

See http://rpm.livna.org/rlowiki/

Linux Archive

Livna does not target Red Hat, use this instead:
http://dag.wieers.com/rpm/packages/

dag.wieers and atrpms are pretty much all I ever need for stuff not from RHEL. Just remember if you ever need support from RH they may ask you to remove anything that they do not support before they will proceed with support.