The first post in this thread probably missed it, as Puppy Linux is known by that name, "Puppy Linux".
The default download is a live-CD iso file.
The main page is:
http://www.goosee.com/puppy
or:
http://www.puppylinux.com
Basically, Puppy is a 50M live-CD distro with everything, including the kitchen sink.
Popularity continually rising, pace of development rapid.