The Resource Tagger Plug-in adds tagging functionality to Eclipse such that resources may be tagged similar to the content tagging in Del.icio.us and Gmail. The tagged resources may then be managed, searched, filtered, or otherwise operated on by their tag associations.
How do I install it?
Installation is easy and there are two ways to do it. You can either download the jar file and drop it into your Eclipse plugins directory or you can add the update site (http://taggerplugin.sourceforge.net/update) to your Eclipse update configuration. I recommend the update site so that you always have the most current version.
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Recommend the tutorial