Maybe fantastic was a bit over the top, but it is very neat.
I found, just after posting that comment, that in a later post steev had added a method to integrate with streetmap.co.uk. I’m not sure why anyone would want to do this, I’ve always thought streetmap’s maps were pretty poor and the interface sucks compared to GoogleMaps or Mappy or MultiMap. I tried it out, though. And it just confirmed my suspicions about streetmap. Certainly for the area I’m taking photos in, the neither Googles nor streetmap’s maps are very good, but Google’s look and work better and have the added functionality of the little floating speech bubbles with thumbnails. So I’ve switched back to GoogleMaps for now.