Fascinating project, this openstreetmap.

I have already started contributing: a few road in Freising and a few Roads in Aschheim.

I will be concentrating on the area around Aschheim, an area bounded by the A99 in the north and east, by the A94 in the south and the river Isar in the west.

Apart from that I will of course always have my GPS with me.

Using GPS and a digital voice recorder works best for me.