If you are thinking of the light weight Linux distros, few can miss the Puppy Linux. Now with the release of Lucid Puppy 5.2.8 and Slacko Puppy 5.3.3, puppy has more variety to choose from and a more pleasing desktop.
I downloaded both the versions from the download page. Slacko is built with Slackware binary
packages whereas Lucid is from Ubuntu 10.04 packages. Another Precise Puppy from