I made my first real contribution the other day by using Potlatch 2 and the Bing imagery to add the pond in the Cowra Japanese Garden. I plan to go there later this month for their annual Sakura festival. We don't get a lot of that sort of stuff in rural Australia.
Anyway, I have two issues. Firstly is Bing image alignment. All of the roads around the Japanese garden are offset by a few metres compared to the Bing aerial imagery. Should I try to duplicate this offset in my edits? And should I realign surrounding roads, etc? I'd like to at least add the parking lot, which is just an extension of the access road. So I'm not sure what to do about that.
Secondly, I tried tracing some of the foot paths within the garden, but they're not so clear in the Bing images. So I checked in Google Earth, where they're much easier to see. But is this then considered a derived work? I'm not tracing the Google images, but I am using them to help me make sense of the Bing images. Certainly on some of the paths I couldn't have traced them if I had only used the Bing images. So I'm leaving that for now.