Developer's Source Bank
Free pdf books for C++, Java, and Language Translation
JDK 1.2 API Documentation
JDK 1.3 API Documentation
What is Microsoft's new C# language?
www.freecode.com
Gnu's Not Unix and The Free Software Foundation
http://freebooks.by.ru/
Dictionary of Algorithms, Data Structures, and Problems
Java code samples from Sun
Dinkum C/C++ Library Reference
Standard Template Library Programmer's Guide
Jini 1.1 API Documentation
Here are two artcles that explain how it relates to Java
C#: A language alternative or just J--?, Part 1
C#: A language alternative or just J--?, Part 2