yum upgrade

[Chris Jones]

>
> Note that the downloaded update packages remain under /var/cache/yum
> even after they are installed.  If you have other systems you
> can copy them in place so you don't have to download again or
> if you don't have other systems you can 'yum clean all' to remove
> them and save space.

I think, just for the record, thats only true for FC4. For FC5 the default 
behavior was switched to delete them after installation.