I don't know if you agree, but I think that there could be multiple-language lessons where you have the same task to complete in different languages at once, or maybe a multi-part thing where the output from one is used in the other to complete a single lesson.
I think that might attract some of the more seasoned folks as well.
Yes definitely. You could do that now using our course creator tool (http://www.codecademy.com/creator), where different sections could be teaching a different languages.
Also related to that is teaching one language in terms of the other "Introduction to X for Y programmers".
