A while ago I made this:

http://www.lulu.com/content/2045656

...mostly for myself. It's geared towards large format. You can make one of your own pretty easy, or many folks use those waterproof notebooks (the name escapes me). Some kind of log is essential for large format, or any kind of work like night photography where it is useful to know what you did in hindsight, so you can do it again, make intelligent adjustment based on observable results with known facts, or at least half the time in my case, what not to do again