This came out a month back, iirc.

I read a chapter on writing API's. Nice chapter. Not to be sarcastic, but he does help us understand how to get around the limitation of not being able to create multiple constructors for a class. Coming from a Java background, that was one really confusing thing in ruby.

Yay for the short half-life of HN! http://news.ycombinator.com/item?id=1198924

But for those who enjoy the book, I've already moved on to my next project: http://www.rubyproblems.com/

The Ruby Problems site looks like it could be really interesting.

Couple of suggestions, if you had a one off membership fee (instead of $3 per solution), and a way of registering without using OpenID, I would have signed up/paid immediately.