I like to cobble together custom notepaper for my campaigns to record what happens during any particular game session. I'm really bad at keeping track of all the activities the PC's get themselves up to, and this helps make it more enjoyable.
This is the one I've created for my upcoming homebrew Traveller game; Traveller Session Notepaper
This link is on my Summonings page on the blog. I've added additional Traveller pages and I do tweak the format from time to time.