To keep "bookmarks," like a to-read, or a to-remember, kind of deal. I used to use del.icio.us, but stopped for some reason. It's still around, but I wonder if there's anything better?
I guess I need that too. Right now, I just leave the tabs open in Chrome until I read them. So I often have 30-50 open tabs. I use multiple profiles, so just open them in a diff profile, and leave them there.