We have a Sierra Club member that works in our office and each year we are lucky enough that my employer purchases each of us a Sierra Club wall calendar or engagement calendar for our desk. I always opt for the engagement calendar and it becomes like my right arm. I record everything that goes on in our company plus all of my personal information throughout the year. I now have about 10 years worth of back issues and I can tell you everything that has happened in my life and that of my family over those years. It has been helpful in many business meetings, but more so in my personal life. I used it a few years back for specific times and dates, names, conversations, and doctor appointments for a lawsuit. Not only did that engagement calendar help me but it is beautiful to look at, with so many pictures of our wildlife and nature that are truly works of art. I like the fact that a portion of the proceeds go to support our environment, something which is very important to me.