I really like maps. I could spend the entire day on Google Earth or in an atlas. Maps interest me because they get my imagination going. There are tons of places on a map that I would love to go and actually see what it looks like in person.
That's why I like Wayfaring.com. It is a community map, using Google's map technology. It allows people to create their own maps and leave notes about places on the map. It helps you pick up on some extra details about places, you would otherwise never know about.
Whether you are mapping a trip or all the houses of your friends, it's a fun tool to play with.