If logging in calories on the computer is a bit much for you, then do what I do, and use a small sized notebook. I buy the small spiral kind that will fit in my purse for about $1-$2. They last for about 2 months each, and I can take it with me anywhere.
I often recommend that if you are interested in a plan that comes from a book, such as Atkins, South Beach, Body For Life, etc. that you check them out from the library, especially if you want to review 3-4 plans before deciding. It is much cheaper to get a library card, then it is to buy 3-4 hardback books from the store.