yum question

[Douglas Phillipson]

The default yum.conf that fedora comes with has several entries:

[base]
name=Fedora Core $releasever - $basearch - Base
baseurl=http://download.fedora.redhat.com/pub/fedora/linux/core/$releasever/$bas
earch/os/

[updates-released]
name=Fedora Core $releasever - $basearch - Released Updates
baseurl=http://download.fedora.redhat.com/pub/fedora/linux/core/updates/$release
ver/$basearch/

[fedora-stable-9]
name=Fedora Project Stable RPMS for RHL 9
baseurl=http://download.fedora.us/fedora/redhat/9/i386/yum/stable/


Is it ok to put more repositories in yum.conf?  Can you also add testing 
and unstable entries along with them.  Will they ever conflict with each 
other in any way?  I see several repositories at 
http://linux.duke.edu/projects/yum/repos/.  Are there more?  How do you 
get a list of what's on each repository besides adding it to yum and 
running "yum list"?

Can you use other repositories besides those that start with "fedora"?

Thanks

Doug P