[CentOS] Created a custom/minimal CentOS 5.x install ISO

Hi all,

I'd like to try rolling a somewhat stripped down and customized CentOS DVD. This is particularly interesting to me now that CentOS 5.5 is 2 DVDs. I dare not call it a new distro as I suspect I will be the only one to use it. ;)

I've been googling for ways to do this, figuring it must be somewhat straight forward, but my google-fu is weak it seems. Can someone point me to a how-to or doc on rolling your own CentOS derivative ISO? Also, I'm not talking about just rolling a new ISO, I can do that already, I want to update the list of RPMs (not)available to the installer.

Thanks!

PS - I found this link, but it's from 2006. Otherwise it's in-line with the kind of thing I want to do: http://lateral.netmanagers.com.ar/stories/38.html