Awesome, thanks! I've always thought the use of books to teach programming was a bit ironic, especially for interpreted languages.

Back in the early '90s I had a book called Master C, which came with a floppy that ran a similar type of tutorial.

http://www.amazon.com/Waite-Groups-Master-Book-Disks/dp/1878...

Seems like a long gap between then and now.

Also, please let me request a course on Clojure. That would rule!