By Yukihiro "Matz" Matsumoto; O'Reilly and Associates, 2001, ISBN 0596002149. By programmer, and Ruby creator; concise broad reference guide assumes reader knows programming. [O'Reilly and Associates]
By Lucas Carlson, Leonard Richardson; O'Reilly, 2006, ISBN 0596523696. From data structures to algorithms to integrating with new technologies; when solving a problem, don't reinvent the wheel: look it up in here. O'Reilly Media.
By Rob Orsini; O'Reilly Media, 2007, ISBN 9780596527310. From basics (install Rails, set up development environment), to latest techniques (developing RESTful web services). Each recipe has tested solution, treatment of how and why it works.
By Mark Lutz. O'Reilly book sample. Introduces Internet related topics: Zope (web publishing framework), HTMLgen (makes web pages from objects), Jython (Python for Java), XML processing, server pages, Windows web scripting extensions, restricted execu...
Used by Palm in their developer training, this tutorial-style book published by O'Reilly shows intermediate to experienced C programmers how to build a Palm application from the ground up.