Caching updates locally

["Joe Tseng" <joe_tseng@xxxxxxxxxxx>]

I want to be able to cache yum updates locally so when I build machines via 
kickstart I can have them update more quickly from a local server.  I can't 
seem to recall how to do this using wget, and googling hasn't turned 
anything up yet.  Does anyone know of some page that describes how to do 
this?  Thx.

- Joe