Rick-click menu

I've just noticed that the Wall Street Journal online has a right-click menu to search their article on their HTML text. The Firefox already has this feature for while for searching selected text on Google. I even installed a Firefox plug-in so that I can search Google image, IMDB, or dictionary.com by right-click on any selected text. The funny thing is that I saw this on wsj.com first, none of my favorite web2.0 sites has this yet.