How can I prepare my own distro DVD?
 

I was happy to use some different distros:
Mandrake, Ubunutu, DesktopBSD, PCBSD, MEPIS, Kubuntu

I like KDE and Ubuntu.
But sometimes I should reinstall my system.

Everytime I did so, I should reinstall all my favorite packages and remove others.

Does exist a method to have my favorite distro (Kubuntu or other) with my favorite packages out-of-the-box?

You need to look into Remastering Linux - a Google search for those 2 words will give you a number of resources to read up on.