Some months ago, I heard about the Time Travel London Explorer app, a nifty iPhone application that allows you to layer different historical maps of London on top of each other, so you can use GPS to see how the street you are standing in has changed (or not) since 1746.
I was so excited I went out and bought an iPhone in anticipation and wasn’t disappointed when the app was finally completed. It features four different maps – Rocque 1746, Horwood 1799, Greenwood 1830 and Stanford 1862 – as well as lots of easily searchable historical information and photographs of London, along with audio guides. You can read a review here.
It’s a bit like the Museum of London’s Street Museum app only better as fading in from one historic map to another is fun and informative.
The Time Travel Explorer website features a blog about mapping and London history written by myself and M@ from Londonist. If this is the kind of thing that gets you going – and really, how could it not? – go check us out.
The Great Wen 
Reads post… buys app… will use this to accompany me on my open housing this weekend (am doing only East London things as want to avoid the Papal traffic jam)
Love the map image. App sounds cool, thanks for the write up.
– Sarah