Just a quick word on a book I discovered recently and which every serious (and not so serious !) Ruby programmer should definitely purchase : Ruby Best Practices. Actually you don’t have to get your credit card, it is available for free download !
It is especially very useful when you are writing your Ruby libraries and you want to do stuff well. The book tackles almost every step of the library building process, namely : tests, APIs design, Ruby basements understanding, and so on…
See ya space hackers !
Edit : the link is currently broken. I don’t know what is the author’s policy, so send me an e-mail if you want the pdf.