I just discovered OpenStreetMap.org the other day while comparing applications on the iPhone. Namely my Brother-in-Law introduced me to Trails for the iPhone from which of course I came across OpenStreetMap.org.
At first I was disappointed with the lack of streets in my area and then I realized that I could improve the situation by mapping out areas myself.
Watchout for new mapping happening just North/West of Toowoomba Queensland.