Read it Later is a browser plugin that lets you build a list of bookmarks so you can "read it later". I haven't tried it (I prefer Instapaper), but I'm told it's really good.
They just announced a new feature today. It's called Digest, and it's in beta. You now have the option of seeing your bookmarks organized by topic and with excerpts. Previously you could only see a list of titles.
Instapaper is also limited to just a list of titles. My list is currently so long that I'm past the point where I can easily find a particular link. I can see the value of Digest.