Mapping MonkeyFilter
I’m quite impressed with xplanet ( http://xplanet.sf.net/). You can give it a text file containing lat, long, and markers and generate a map of the world with people’s locations on it. Put it on a Wiki so people can edit it and you get
http://wiki.monkeyfilter.com/index.php?title=MonkeyMap
The tricky thing is figuring out how to do just part of the world, such as North America. The world map is a projection but you can’t zoom in on a projected view. Turns out you can put it in globe mode, centre on the area you want to record, and zoom in so that it looks flat.