Thanks so much for your feedback. The way we think about it - there's two reasons to organize the thing's you've seen. Self-reference for later, and also, just so your friends have a place to browse it if they want to. I could tell a friend, yah go check out all the advice I've read on pitching - there's lots of good stuff there in my 'pitching' channel :). For those people, they now have a place to browse what you've seen, and they can thank you for posting it, and respond.
The nice thing, is that we're working on ways to make the categorization as automatic as possible (e.g. via crowdsourcing etc) - so that for you its easy to say you saw it, and then it goes into the appropriate topic.
We're also thinking about the ways to differentiate between the links that stand out, and the ones that don't in the long term. For example, based on your friends' reaction to it, your own indication of its importance, and other metrics. That way, this becomes a more useful showcase and memory of your web experience.