my name is Christoph Brill and mapped most of Koblenz in Germany and few places around it. I'm using a Navibe GB732 combined with my SonyEricsson K800i to record the data (and take photos). I'm doing most of the GPS logging riding my bike or driving my car; walking is to slow to get useful traces with this GPS receiver. So if you see a guy driving around your house many times don't think it's a stalker as it might be me ;-)
License & Co.
Suggested reading on data licenses and running a succesful non-profit based on free data.