Marco Arment on linking:
"Don’t replace it. Send your readers there."
There has been a lot of talk, again, about linking to sites, attribution, and rewriting the source. Despite appearances, I have actually thought a lot about the format of my linked posts. Using a dark and bold typeface, consistent placement of the source link using the writer or the site name as the title of the link, a Unicode symbols for those who associate with symbols, and a mention in the first line of who actually wrote the post, I have never once tried to hide a source.
The reason why I don't incorporate a DF-style link post is honestly because I designed it the way I want to read blogs. A lot of the time, the analysis by the writer is better1 than the actual source. But if I were to send that post to Instapaper via my RSS reader or the Google Reader website, it would send the source and not the analysis.
Also, when I attribute to another site for originally finding the link, it becomes more difficult when all that's being bookmarked or Instapaper'd is the original post and not my source for finding that post.
Last but not least, I try hard not to spoil a post through a blockquote or a summary. Like what Marco said, my goal is to actually send you to see the site, not spoil the surprise.