EDIT 9/2/15: Taken offline for now (for the reasons below). Hope anyone who wanted a look had the chance! And let me know if you want more info on the "how to" side of things.
Okay, so I did a Thing with Stephen Walter's new map of the Rivers of London. I georeferenced it and created a scalable, transparent overlay for Google Maps, so you can zoom about and change transparency (with the volume slider-like thingy, top right) and see how the rivers (particularly the hidden ones!) relate to modern day London.
I've uploaded it so that people can have a look, but I won't leave it up for very long because I'd really want to get permission from the artist. This was mostly to create something I could play about with offline - if it were to go up "properly", I'd create additional layers or pins with points of interest from the books (I think I might have seen something similar on BA's blog).
Ultimately, it could form part of a great splash page for a site with info tagged to the map - you can even geotag wordpress posts and generate pins on the map using the metadata, although it requires a bit of hacking of the php.
But yes, if you're curious, have a look - I'll leave it up over the weekend.
And if you wanted to recreate it yourself, you'll need:
