IntelliJ Idea Quick Reference Card (and other highly recommended goodies).

 

IntelliJ Idea Quick Reference Card


This IntelliJ Idea Quick Reference Card may be a good starting point to get familiar with Idea's interesting features.
Checkout "Alt + Insert", "CTRL + Alt + T" or any of the great Live Templates.
Learning some of these keystrokes makes you an instant serial programmer!
(And it will probably contribute to overall code quality as well)
Download a .pdf copy here.

More reference cards can be found on:

 

Great free downloadable books

Books in the left hand column are freely downloadable from their respective homepages.
The books in the right hand column are not really downloadable, but nonetheless highly recommended!

The Java Language Specification, 2nd Edition

Bill Joy (Editor), Guy Steele, James Gosling, Gilad Bracha

Addison-Wesley Pub Co
ISBN: 0201310082
June 5, 2000

Bitter Java

Bruce A. Tate

Manning Publications Company
ISBN: 193011043X
April 2002

Mastering Enterprise Java Beans Second Edition

Ed Roman, Scott W. Ambler, Tyler Jewell, Floyd Marinescu

John Wiley & Sons
ISBN: 0471417114
December 14, 2001

The Pragmatic Programmer: From Journeyman to Master

Andrew Hunt, David Thomas, Ward Cunningham

Addison-Wesley Pub Co
ISBN: 020161622X
October 20, 1999

Java Data Objects

Robin M. Roos

Addison Wesley Professional
ISBN: 0321123808
October 25, 2002

Refactoring: Improving the Design of Existing Code

Martin Fowler, Kent Beck (Contributor), John Brant (Contributor), William Opdyke, don Roberts

Addison-Wesley Pub Co
ISBN: 0201485672
June 28, 1999

EJB Design Patterns

Floyd Marinescu, Ed Roman

John Wiley & Sons
ISBN: 0471208310
February 19, 2002

Effective Java Programming Language Guide

Joshua Bloch

Addison Wesley Professional
ISBN: 0201310058
June 5, 2001

Programming Ruby

David Thomas, Andrew Hunt, Dave Thomas

Addison Wesley
ISBN: 0201710897
December 15, 2000

Java Pitfalls: Time-Saving Solutions and Workarounds to Improve Programs

Michael C. Daconta (Editor), Eric Monk, J. Paul Keller, Bohnenberger, Keith Bohnenberger

John Wiley & Sons
ISBN: 0471361747
April 20, 2000

Swing

Matthew Robinson, Pavel A. Vorobiev

Manning Publications Company
ISBN: 1884777848
December 1999

Java Performance Tuning

Jack Shirazi

O'Reilly & Associates
ISBN: 0596000154
January 15, 2000

Thinking in Java 2nd Edition

Bruce Eckel

Prentice Hall PTR
ISBN: 0130273635
May 31, 2000

Rapid Development: Taming Wild Software Schedules

Steve C McConnell

Microsoft Press
ISBN: 1556159005
July 1996

Processing XML with Java

Elliote Rusty Harold

Addison Wesley Professional
ISBN: 0201771861
November 15, 2002

Information Architecture for the World Wide Web: Designing Large-Scale Web Sites

Louis Rosenfeld, Peter Morville, Jakob Nielsen

O'Reilly & Associates
ISBN: 0596000359
August 15, 2002

Core Servlets and JavaServer Pages

Marty Hall

Prentice Hall PTR
ISBN: 0130893404
May 26, 2000

The Elements of Java Style

Allan Vermeulen (Author), Scott W. Ambler (Author), Greg Bumgardner (Author), Eldon Metz (Author), Trevor Misfeldt (Author), Jim Shur (Author), Alan Vermeulen, Patrick Thompson

Cambridge University Press
ISBN: 0521777682
January 2000