I am launching javadocs.org today! The site is strikingly similar to my cfdocs site for CFML, but just as useful.
The site is basically a URL shortcut to java documentation, for example if you want the documentation for the String class, simply type: javadocs.org/string. You can also type in the full class name javadocs.org/java.lang.string, but only the class name is needed (which is nice if your not sure what package a class is in).
You can also type in a package name, for example: javadocs.org/java.util
I will attempt to keep it up to date with the latest java documentation. It currently points to J2SE 1.4.2, and J2EE 1.4.
Comments and suggestions are welcome.