Java Deployment with JNLP and WebStart - Two samples chapters from book by Dr. Mauro Marinilli, published by Sams Publishing. - http://java.sun.com/developer/Books/javaprogramming/jnlp/
Netx - Open source JNLP client. [GPL] - http://jnlp.sourceforge.net/netx/
JSR 56 - Formal Java Network Launching Protocol and API specification. - http://www.jcp.org/en/jsr/detail?id=56
Fontanus JNLP Wrapper - Allows any Java application to be distributed, without modification, using JNLP. [Shareware, free for non-profit] - http://www.fontanus.com/products/jnlp-wrapper/index.jsp
Juniper - Server-side implementation project of the JNLP protocol. - http://sourceforge.net/projects/juniper/
Java Web Start to the Rescue - JavaWorld article to help developers get started with Java Web Start. - http://www.javaworld.com/javaworld/jw-07-2001/jw-0706-webstart.html
JNLP API Reference 1.0 - API documentation for javax.jnlp package. - http://java.sun.com/products/javawebstart/docs/javadoc/index.html
Java Web Start Developer's Guide - Includes system requirements and development information. - http://java.sun.com/products/javawebstart/docs/developersguide.html
Java Web Start and Code Signing - Article describing experience using Java Web Start and digitially signing code. - http://www.dallaway.com/acad/webstart/
OpenJNLP - An implementation of the Java Network Launching Protocol (JNLP). [Open source, MPL 1.1] - http://openjnlp.nanode.org/
Java Web Start on Mac OS X - Apple Developer Connection information and documentation on Macintosh support. - http://developer.apple.com/java/javawebstart/
Java Web Start - Provides web-based deployment of programs that run outside the browser in secure sandbox. [Free] - http://java.sun.com/products/javawebstart/