This site does a great job of making JavaScript fun to learn. The challenges help you remember what you have learned. I highly recommend trying it out!
Code Avengers http://codeavengers.com is a free interactive online tutorial that will help you get started on Javascript. There is obviously much much more but this will help beginners learn basic skills.
Code Avengers http://codeavengers.com is a free interactive online tutorial that will teach you Javascript. My brother created it and I think its the funnest and most effective way to learn.