I'm linking to these because I'm proud of them, but they're over a decade out of date, so I can't recommend them as a technical resource anymore :)

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The Art of Rails (2008)

Described by an Amazon reviewier as a "phenomenal follow-on book for anyone who has completed a beginner Ruby on Rails book and is looking for moving on to the next step."Rails has undergone a lot of changes lately, but the underlying design patterns that this book addresses remain the same.

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Professional Rich Internet Applications (2007)

A developer's suvery of Web 2.0 techniques, back from the days when "ajax" was a new term and jQuery didn't even exist!