Recently I read about Semantic Radar over at Frédérick Giasson’s weblog. Semantic Radar is a plug-in for Firefox, notifying the user if it finds SIOC, FOAF or DOAP data referenced by the page he or she is currently viewing. When such data is detected a little icon will appear on the bottom right side of you browser, which lets you access the embedded data easily. I really like this little helper!