What Are Some of the Best Self-published Books on Ruby?

We recently published an article on Lazy Enumerables by Benjamin
Tan Wei Hao. Benjamin self-published a book called The Ruby Closures
Book, which is an amazing text on a part of Ruby we all need to know
better. By the way, you can earn a change at a free copy of The Ruby
Closures Book, by leaving a comment on that article.

My question today is: What are some of the best self-published books on Ruby?

I have a Gist that lists several books - from Free Programming Books - I am trying to get around to reading; including many Ruby books.

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