This is actually pretty handy.  On the one hand, javascript that messes with the user like this strikes me as unethical (it really angers me when basic functionality is usurped like this), this one would actually save me time in the long run.  Usually when I copy/paste text from an article on one tab to a form on another, I also copy and paste the link as well.  Usually that involves two trips to the article's tab.  I wouldn't have to do that with this article.