A lot of programming books on Ruby can be obtained from this site :
http://pspxworld.com/BOOK/PROGRAMMING/RUBY.php
Little Book Of
Ruby
Learning R. with
Satish T.
Data Structures and
Algorithms with Object-Oriented Design Patterns in RubyRubyCHannel
Tutorial (Poignant) Guide to
Ruby Ruby U.
Guide Qt
Tutorial #1 - The 14 Steps