I have a notebook (moleskine atm, but I've used a lot of other brands/kinds) for sketching out and expressing ideas/insights and I use Evernote for long-term storage, project management, and to store reference material. I also use Safari's reading list to hold on to things I want to read, but don't know if I want to save permanently.
Edit: I seriously keep everything in Evernote, whats up with the down votes?
Don't know why somebody downvoted you, I've upvoted your post. I also use notebooks, mostly when I'm away from computer but as you, I'm using it for sketching and brainstorming sessions.
Do you regularly review things in your Safari's reading list or it keeps growing? Because that's the problem in my case.
My reading list is pretty big. I keep articles there until I get around to reading them, if they seem like something I want to keep around I clip them to Evernote and remove them from the list. In some cases I'll just move them into bookmarks which are mostly unsorted, as I use them primarily as a durable form of browsing history.
Edit: I seriously keep everything in Evernote, whats up with the down votes?