MintPup

MintPup is small 32-bit Ubuntu/Mint based live CD shaped to look and act like Puppy Linux.
Ubuntu structure and Ubuntu behaviour are untouched and Ubuntu/Mint documentation is valid for MintPup. You have access to all Ubuntu/Mint repositories using apt-get or synaptic.
Update: Mintpup has been discontinued
Iso still available here:
Thanks to Ally: MintPup at archive.org