Learn JavaScript Programming by Codeacademy
Codeacademy is an interesting website where you can learn JavaScript programming online. Advantage over here is you can measure your learning, share with your friends and even check their progress.
This project aims to teach you JavaScript, which is essential to build any interesting website or an app or games. You need to sign up but Facebook log in is allowed. There is some thing called scratch pad, where you can try your lessons learnt, to check your coding knowledge. No compilers or simulators are required to compile your code. Everything is online and instant 
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It is very interactive and future of online education.
