Hi,
I saw, Potlatch 0.6 is now online.
But it is not corrent working, when the Yahoo maps are displayed in the background. The map is not correctly scaled and when I move around, the satmap does not match to the roadmap.
See screenshot.
Browser Firefox 2.x, Linux
It should be fixed by now, if you still have an offset: You can try aligning the images with known well positioned ways by holding while dragging the images around.