I used to keep a journal everyday, but in the past year or so, I've been lazy. I do have a postcard collection, but that doesn't give the details of the trip. I keep stubs, boarding passes, past itineraries, receipts and various brochures in a drawer.
Perhaps it's time to start scrapbooks for past trips, before all the memories fade. It'll help plan the next trip. Most people at work save their money and go on vacation (say, DisneyWorld or Hawaii), thinking "I'm going to see everything right now, because I probably won't ever return since I've already been there." I always know that I'll return.
Linda