Well, it’s probably just new to ME, but Zemanta is a lovely add-on for Firefox which provides images, links and articles related to whatever you are posting. It all shows up in a sidebar as you work. The appropriate citations seem to be
linked in too, so there’s less fear of upsetting someone’s copyrighted material. I just started using this 10 minutes ago, but I think we’re going to have a long, happy relationship!