OpenStreetMap
I have been mapping for a while now. The yahoo satellite images are very helpful, but sometimes seriously outdated.
I wonder if there is an other way of adding roads aside from driving there and using gps (and have people stare at you, when on foot or bicycle).
Also, if you are mapping in Belgian Limburg, feel free to contact me.
Discussion
Comment from LivingWithDragons on 19 September 2008 at 12:55
If you can get a public domain map, or get permission from the copyright owner to copy their map into OSM, then you can upload it with http://wrp.geothings.net/ and then trace from it in JOSM. That also works for aerial photos you might have (if you happen to have a helicopter handy).
The only problem is making sure you have permission to use the data you trace and tagging what you map with source=something_sensible.
In the U.K. we have some maps are over 50 years old, making their copyright invalid. I think it can be 75 years in some cases/places till that happens.