FlightMemory.com is a site that lets you enter all the data from your previous airline flights. It produces a cool map drawing lines between all the cities you have flown. It also aggregates all the miles you’ve flown and produces interesting statistics, such as the number of times you have circumnavigated the Earth, your total flight miles in terms of trips to the moon or to the sun. There are some other neat things as well.
To see my personal flight history (which is incomplete as of this date) click on the banner below: