As it is now, I have to go through and copy important encounters, rooms, treasures and stats into a notebook for the expected next session. Just so I can look at them AND the map at the same time- and not be constantly looking stuff up in the appendices. I also leave enough space for round by round combat logs: initiative order, HP totals, who does what, condition and spell/effect durations (and when they end), and other things like when others might join the fight. And, at the end, XP for that encounter; any items the party found, and any loot. I'll also make a note of who is wounded, and any healing done to them.