By Russ Olsen; Addison-Wesley Professional, 2007, ISBN 9780321490452. Shows smart ways to solve many problems Ruby developers often find; classic patterns plus newer ones with special Ruby value.
By Michael Hartl, Aurelius Prochazka; Addison-Wesley Professional, 2007, ISBN 9780321480798. Shows how to build large projects with RoR by developing real application step by step, from basics to a highly dynamic site.
By Obie Fernandez; Addison-Wesley Professional, 2007, ISBN 9780321445612. Comprehensive, authoritative experts guide to building production-quality software; shows full API, Ruby idioms, design approaches, libraries, plug-ins.