(I don't disagree that exposing kids to the command line is probably a valuable thing, but the idea that kids who learned to type a magic command to launch games on C64 have more useful knowledge than kids brought up on Mac/Windows is frankly stupid.)
Last night my five-year-old daughter complained her iPad was out of battery so I gave her my Nexus 7 and she had no problems using it (except for the relatively poorer quality of the apps). Then I gave her my Kindle Fire and she had no problem using that. (No, she can't read beyond numbers and sounding out words slowly.)
It's sad how because my daughter has been brought up on GUIs she can't run a computer from the command-line. No, wait, it isn't.