Well, I don't play in many long standing campaigns anymore as I mostly do one off games for playtesting purposes. When we do play longer games, I DON'T encourage note taking. If they want to write stuff down, that's fine by me and I can't stop them. Personally, I don't have a notebook that I walk around with in modern life and use it to write down names of people I met and places I've been to.
I just let my players try to remember on their own. If they don't, I let them make a WIS check with a varying DC based on how obscure the knowledge is. I also thought of having a feat called Concise Memory which would give a +4 bonus. I use WIS because that's your ability to retain information. Even in the 3.5 PHB on page 9 it describes an absentminded professor as having a high INT and a low WIS. Why would you use INT?