For those Android Developers who still use a small part of the Eclipse PMD plugin, the Juno version of the plugin is at:
http://sourceforge.net/projects/pmd/files/pmd-eclipse/update-site/
That is the update site url and this plugin uses PMD 5.1, and the snapshot for that is at:
http://pmd.adabolo.de/job/pmd-trunk/
You will want the last successful artifact jar.