I finally came around modifying the build scripts in the CI server a little so that you have browsable online javadocs. The ones in SVN are pretty out of date, so i figured we should build them each day and serve them from the same host as the nightlies themselves. You can find them at http://libgdx.l33tlabs.org/docs/api/
Note: each release/nightly comes with an offline version of the docs! You can also add the gdx-sources.jar to your project so you have the javadocs in Eclipse/Netbeans/Idea.