At intigi.com we're trying to solve this problem and have a beta product working. It not only helps you find interesting links in the way described in the article, but it also helps curating and sharing them.
In addition, your system seems to be more about automatically finding content, whereas the OP's system is much more manual and curated by the user.
I signed up for your beta list because I actually think your idea is interesting, but I think they solve two different problems.