I hate making sure the javadocs for all the third party libraries I’m using are uptodate and trying to remember which directory did I install them into. This is why the emergence of searchable javadoc archives is really helpful.
Both of these have been around for quite some time, but I just finished playing around with them a little bit.
Both also have Eclipse plugins and JDocs also has a FireFox plugin. The docjar Eclipse plugin has a free for non-commercial use license, which pretty much excludes me from using it, especially since JDocs Eclipse plugin is free.
The Eclipse plugin for JDocs is extremely nice, and surprisingly fast. A great addition to any developer’s toolkit.
-TPP