A lot of people use Pinterest like this.
Personally, I've always been fond of Delicious. It's old, but I like saving things where they're integrated with the browser, tagged by topic, saved remotely, and easily accessed from other computers. Between the tagging and the search function, it's quite easy to find things later.
That makes sense about Pinterest, that's close to how I would want it to be set. The social network distraction part about Pinterest kinda keeps me away though.
I've used delicious on and off, but it just wasn't quite doing it for me. It feels so left-brained like all the other bookmark options. But maybe there's more and I haven't jumped into all the features enough.
I want something more right-brained that includes:
-A Visual Image of each Site. Basically a 6x larger FavIcon.
-Something that I can tag each site by color(s), with each color representing something, and sites can be sorted by color.
-Each site can be simply clicked on, but you can also right-click and have a dropdown list of your favorite posts that you've saved from that site.
-Ability to save images and take screenshots. (searchable image text would be great too).
There's quite a few other features that would be nice, but just these alone would be enough to get me to use it.