[derefr]

What language would you recommend, if you wanted to make something accessible for, say, teenagers who haven't even taken the perfunctory "Introduction to Control Structures In Blub" course yet? Javascript seems like a good guess for "language you might pick up just from everyday computer use." (Another two being, I think, Windows batch files, and Excel macros.)

[EpicEng]

I can't imagine how anyone would pick up bits of js just from everyday computer use. How many people even now the the "view source" button in their browser even exists? Excel and batch files / shell scripts I could see though.

[SkyMarshal]

Consider you'll probably lose lawyers like Grellas and a few others who contribute a great deal here (I think rayiner, and people in other disciplines (a few scientists here and there) who may not know programming but know their vertical better than most hackers and have a lot to contribute in that respect.

It's an interesting idea for some kind of expertise test to contribute to a public forum, but it will be very self-selecting too.