Puppy Linux

When you hear the word "puppy" you think of small and cute. Well that basically describes a Linux distro that is less then 100 megs. Ok,  maybe its not cute, but its small and that is what makes it so useful. This little OS can fit on a flash drive and is bootable from a flash drive or CD. The small OS can either be installed on the hard drive or it can run right from the flash drive. The graphics mode can be set to run on basic, so it can run on older computers. This is a good OS to put on a kid's computer that might be older and having problems running later versions of Windows. 

Give it a try:http://www.puppylinux.com/