I love Codecademy.com's Code Year. I really do. I look forward to every Monday (at about 9:30 am PST) when that lovely email arrives in my inbox, announcing the release of that week's lesson.
That said, ARGH! I took a little break from the lessons when my previously accepted code kept getting "oops, try again" errors. (ARGH!) I picked it up again this morning on Wally, my ancient little iBook G4. It worked beautifully for about two hours. Then the nonsensical error messages started up again.
Back to C#, I guess. There's always the new MIT RELATE physics course...