Not the main point of the article, but he makes a comment that doesn't sit well with me.

> Also for SEO consideration, rel="nofollow" is also recommended.

If you are linking to another site, that helps said site's SEO ranking. If you use this in a way that the search engine views as cheating, the other site is penalized.

But as long as you and the other site are being fair, then you SHOULD link to them - they are obviously providing good content that you think is important, so why try to hog the credit and not give them the ranking they deserve.

Sitye like Stackoverflow do this to cut down on spam, (and perhaps because they want Google to view them as the original), but for a blog or whatever, why would you recommend this?