[CentOS] Custom CentOS5 DVD

Hello,

Does anyone have an up-to-date page describing, step by step, how to make a
customized CentOS5 DVD?

I noticed that CentOS5 already comes with ~240MB of updates.  So for starters,
I'd like to create a new DVD with all the current updates.  (And I have other
custom scripts I need to install on top of that).

I've googled around and tried various suggestions on the net:

http://sipx-wiki.calivia.com/index.php/A_Kickstart_CD_for_sipX_on_CentOS
http://cablemodem.fibertel.com.ar/lateral/stories/38.html

However, I have not been able to find step by step instructions for CentOS5.
For example, genhdlist has been deprecated.  Also, the centos-release-5.0.0 rpm
grabs a new GPG key from the net, even though an identical one is already on
the DVD.  This creates problems on custom DVD's I've created thus far; I'd
like to have an unattended install that doesn't require a network connection.

Thanks very much in advance for your help,

-- Paul