Having just taken a quick look - it seems like a great effort.<p>The only thing that throws me off is the font choice for the code examples. I'm no font-snob, but a monospace font for code just seems much more readable and friendly to programmer readers.<p>Regardless of the font - very glad to see a great effort like this.
His explanation for breaking/ignoring conventions:<p><a href="http://www.reddit.com/r/ruby/comments/8diqr/book_of_ruby_completed_425_pages_300_sample/c08xzgb" rel="nofollow">http://www.reddit.com/r/ruby/comments/8diqr/book_of_ruby_com...</a>
I've began reading this book to patch any holes in my knowledge of ruby. My only suggestion so far is that a new typeface for the code excerpts is needed. Perhaps not necessarily courier (after reading his post on reddit) but ANY other font. I mean really - anything but comic sans. It is widely abused in the world to point where reading it gives me a head ache. Surprisingly enough, I'm not the only one!