Scratched an itch that has been bothering me for ages. Tried using OS_OpenData_StreetView as source for naming Y! traced streets in Harlow, Essex. This is nearest place to me that has been in serious need of map love, and I have previously gibbed at going there mapping (or organising a map party there), mostly because it is none too inspiring. Apart from the fact that not all the streets are named in StreetView it worked reasonably. Using Potlatch (as you do) meant that the names were actually obscured by the OSM detail, so I ended up having 2 browsers open, one to edit and one to see street names (using http://os.openstreetmap.org/). Whilst there I noted some largish wooded areas on OS. If the Yahoo imagery also showed the woods I traced from there, as I feel it is better source, then took name from OS, all tagged with source= or source:name= OS_OpenData_StreetView. Harlow now looks a lot better. Someone needs to go and do the fine-tuning, adding names of smaller roads, adding POIs etc, but a useful test of viability of OS as source when somewhere is already partially mapped. Have had a look at using it also to map the Thames in Berkshire where it needs waterway=riverbank tagging to give reasonable shape as the river is both wide and variable there.