I'm all about apps and keeping things on my computer but I think a book where I can write things down might be a useful option for me. This way if I need to share the info with someone I won't have to print out a bunch of papers.
Although I haven't used it yet, I was given the Baby Daze Organizer. You can order it on babydaze.net or Amazon and it's just $20. It has space for recording feeding/diapering, sleeping, pumping, milestones, gift tracker, food diary, medical and contacts and notes information. The reviews are also solid.