There's a link here... but this is Indigo: PDE plugin for Eclipse - which repository to install from?
Here's a link to the zip file... http://archive.eclipse.org/eclipse/downloads/drops/R-3.8.2-201301310800/#PDESDK
... but extracting it in the plugin directory doesn't work... and I'm afraid to explode out the files amongst the other /plugins, /features and / because I can't afford to break my build of eclipse. Also there are two top level jars in the zip and it doesn't feel right that they sit in the main directory (artifacts.jar and contents.jar).