Lets see if this turns out. Ok, I mapped my photos on Flickr, but Flickr doesn't provide an embeddable map as far as I can tell. They will, however, provide a geoRSS feed, along with a KML file. This KML file can be imported into Google Maps and saved, then that map exported into a blog post. There may be a few problems here. The feed may be a fixed length and there doesn't appear to be feeds associated with individual sets or tags. Oh, there are feeds for specific tags, thats good. So we could constrain a map to a specified set of photos by using tags. That just leaves the possibility of a fixed feed length, which I can live with.