This new fad of providing interactive/iterative consoles for learning technologies (e.g. redis[1], mongodb[2]) is brilliant.

I really well done flow (like this one) reminds me just how fun it is to learn something when it is presented well. I am ashamed to say that if I had to teach someone, say Java, I wouldn't know how to present it in a fun, non-crushing manner.

I am glad there are people out there working on resources like this.

[1] http://try.redis-db.com/

[2] http://www.mongly.com/tutorial/index