Recently potlatch was updated to include the URL by default in potlatch options, this means you just need to click on settings and select it from the drop down rather than needing to manually enter a URL in the custom section.

In case you haven't seen the NearMap imagery yourself, the resolution and quality is better than Google sat imagery. The truly astounding thing is the imagery is only out by 1-3m from known locations and over time I'm sure NearMap will refine their processing to make this even more accurate.

Also we, the Australian OSM community, are currently working on show casing Carnarvon in Western Australia from NearMap imagery by mapping it out as much as possible. Carnarvon is a small town about 1000km from the nearest city.

osm.org/?lat=-24.8821&lon=113.6711&zoom=14