As mentioned, keeping a record of rides or just physical activity in general is motivational. It also provides a measure of fitness status and how well your doing countering the affects of age-related decay. For the fitness/decay aspects, it's useful to be able to compare data (exercise periodicity/average speeds/ride times/times in heart rate zones) over a long period of time.
I have years of data in Cyclistats. You have to buy the program. It gives you a lot of ride data comparison tools and it can load the data from my new Garmin Forerunner 305 heart rate monitor software.
It has provisions for annotating rides and logging bike maintenance/repairs.
Al
Last edited by alcanoe; 09-14-08 at 11:20 AM.