Blockquoted, thoughtfully chosen excerpt, highlighting the article's main argument, perhaps, or a good quote that would drum up a reader's interest or provoke some sort of analysis or observation on the blogger's part, in a way that respects "fair use."Analysis, observation, ranting, raving, etc., perhaps with a call to read the whole thing, which, of course, would include a link.
P.S. When you click through, don't be surprised if you're asked to register for the right to read free content online. And you wonder what's really killing newspapers.
P.P.S. Should you refer to this blog post, I will find your attention flattering.
P.P.P.S. I learned about it on Twitter.
P.P.P.P.S. And thus I have reached the legal limit for postscripts.