Sooner or later you'll have to create Your Personal News Agency. A reader or any aggregator is just the INPUT part of the job but how do you process and make available the generated knowledge, the OUTPUT? In a wiki or a blog post? None of them are semantic so inapropriate for storing knowledge.
Future Readers must focus on the output part of the process otherwise there will be so much input without proper output that everything will look like noise.
When reading information on the web or through my feedreader, newsbeuter, I use Zim (http://zim-wiki.org) to take notes on whatever I think I may want to refer back to in the future. I place notes in an appropriate category, apply a datestamp, and optionally add some tags.
Zim automatically indexes everything, so when I need to find out how to apply that cool Rails trick I read about 3 weeks ago, it's easily found.
So, yes, output is very important, and taking notes helps me get a lot more out of my online reading than if I simply tried to make my brain act as a sponge.
Future Readers must focus on the output part of the process otherwise there will be so much input without proper output that everything will look like noise.
Signal vs. Noise is in fact your I/O rate.