They put it up on Show HN between 2-5 months ago and I would really love to find it again, but google isn't helping me.
Thanks in advance
I'm currently spending a lot of time at Udacity. CS101 was the first resource for learning python that I've been able to through start to finish. (Think Python is second place for me, also very good)
The one area that I still find lacking in on-line learning is math. I can't seem to find anything that's concise, interactive and effective. (Paying is not an option.)
Good luck !