LinuxKidX is a child friendly distro based off of the KDE desktop environment and the Slackware distribution.
Ranked in these QuestionsQuestion Ranking
Pro Live CD
With the Live CD users can test and use the software without having to install the OS. The Live CD will also function no matter the OS on the device at the time.
Con Much of the support material is in Portuguese
LinuxKidX does have an english language version, but much of the support material is in Portuguese, so finding help if issues arise may be a problem.