I think Puppy Linux is great if you have older hardware. Mine will run
Compiz with full effects, so Puppy is probably not for me.

Anything based on Ubuntu does not seem to be a problem for me because
offending proprietary code would have to be stripped out. Even Kubuntu is
not a problem for me, so maybe I just need to be looking at a netbook
solution which is where I run Ubuntu and leave Kubuntu on my desktop. In
that case, Puppy would be a good solution provided that you could add Ubuntu
repos and this I am not sure about.