I quite like the idea of what
7 languages in 7 weeks tries to do, although I wouldn't have picked those seven languages they're a pretty good selection.
7 languages in 7 weeks? Why not Japanese, Spanish, Italian, English, Latin, Mandarin, German and French in 7 weeks? A programming language worth learning is something you learn to think in, which means committing several years to its mastery. Something you can learn in a week is not something worth learning. Do you actually know anyone who learned Haskell or even C in a week?!
http://norvig.com/21-days.html