The standard answer for know Ruby but want more seems to be
Eloquent Ruby: http://www.informit.com/store/product.aspx?isbn=0321584104
It's next on my list.
Read this for a good survey of Ruby books:
The Ruby Reading List - Russ Olsen:
http://www.informit.com/articles/article.aspx?p=1759889
Cheers,
Chris
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The first few chapters are relatively basic: writing idiomatic ruby, extra control structures in ruby like unless and until, strings, regexes, 'everything is an object,' but it's by no means a beginner's book.
It covers plenty of more advanced topics in the later chapters, especially dynamic typing and meta-programming, as well as DSLs. I'd say these are the key things that reformed Java programmers need to get across (being one myself!) to truly get into the mindset of a rubyist. :)
Cheers,
Warren.
Anything by Russ Olsen is worth reading and his list is excellent too. On that list you'll find Ruby Best Practices by Gregory Brown, which I thoroughly recommend. You'd also be well served by spending $8 per month subscribing to http://practicingruby.com - another initiative from Gregory.
Regards,
Keith
Fabio
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