With the recent release of Puppy Linux 4.00, developer Barry Kauler and his team have provided a lightweight but functional Linux operating system. To help reduce size and include more functionality over the previous binary-package-based Puppy 3.01, Puppy 4.00 has been compiled from a Slackware 12-based source. Yet despite its small size -- the ISO file is a meager 87.1MB -- Puppy has an abundance of applications, with more than enough for an average user.