Woof

"Woof is a "magical script" that can download packages of some other GNU/Linux distribution, cut them right down to Puppy-size, then build a Puppy Linux live-CD/DVD -- and do all of this totally automatically. The design of Woof is intended to be so flexible that packages from any distro can be processed.

At the time of writing Woof is supporting Debian, Ubuntu, Slackware and Arch. Puppy can be built from whatever is the current one. Whenever there is a new release, all that Woof needs is the name of the release and Woof will then download all the packages and build a new Puppy Linux."

http://www.puppylinux.com/woof/index.html
http://www.puppylinux.org/?q=wiki/woof-puppy-builder