using squid as a yum cache

[Dr. Michael J. Chudobiak]

Could someone point me to a good tutorial about how to configure squid 
and yum optimally, so squid will act as a cache for yum?

Adding the "proxy" line to yum.conf is obvious, as is enlarging the 
cache object sizes, but are subtler changes needed? For instance, does 
the use of mirror lists cripple the caching, since each client might 
request from a different mirror?

Tips appreciated!

- Mike