In my college days and the years following, I used to write down my prayers in a prayer journal. I found it a very affective tool. If you're like me many times your mind will wander when your praying. Somehow writing everything down just helps your train of thought.
Prayer journals are also great for keeping track of prayer requests and answered prayers. They give you a sense of your own history. When you read your old journals you see where you were in your spiritual life at that time. You tend to remember past events more clearly. A warning - re-reading old journals can sometimes bring back painful memories. However, it can also be a testimonial to how God brought you through a difficult time in your life.
Prayer journaling is not for everyone. Everyone is unique (God made us that way), but if you're looking for a way to stay focused in your prayers, you might want to try it.