More repositories to use with YUM

[C.F. Scheidecker Antunes]

Hello all,

Usually I change my /etc/yum.conf to have other servers other than 
RedHat' s.

I usually have:
[base]
name=Fedora Core $releasever - $basearch - Base
baseurl=http://mirrors.kernel.org/fedora/core/3/i386/os/

[updates-released]
name=Fedora Core $releasever - $basearch - Released Updates
baseurl=http://mirrors.kernel.org/fedora/core/updates/3/i386/

I understand that there are also other repositories where people put 
together multimedia and other RPM packages like Adobe acroread that you 
can use within Yum. I would like to know some of these repositories that 
already have RPMs for FC4.
Any suggestions?

Thanks in advance,
C.F.