[WoodenChair]

I don't know that book, but I just want to be clear that I did not mean to imply that free == bad. On the contrary, there are superb freely available books like Structure and Interpreation of Computer Programs. However, there are also superb books that cost significant amounts of money ($40+). Learning to program is worth a $50, or even $100 investment in a great book if the free books don't match what you're attempting to learn. They're able to sell for that price because they provide value that free alternative resources do not.

My main point is that in my opinion books, interactive or not, are still the best source for learning to program for many, if not most new programmers.