Not sure about directing yum at another boxes yum cache, but you could
setup squid and have it cache large files. I do this with windows
updates myself...

Not exactly what you're looking for, but something to think about down
the road.

-- 
Andrew S. Zbikowski | http://andy.zibnet.us
 A password is like your underwear; Change it
 frequently, don't share it with others, and
     don't ask to borrow someone else's.

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