The lovely and much respect Simon Garfield just adopted it for the endpapers of his forthcoming new book called "On The Map".
And following all the hoo-har are around Apple's new mapping utility on the iPhone5, Frank Jacobs (he of the strangemaps blog & book) also cited my design in todays Guardian. http://www.guardian.co.uk/commentisfree/interactive/2012/sep/07/weird-maps-to-rival-apple-in-pictures
It's quite amazing how often this thing comes up in various web searches. Try it for yourself: just type in these words to google images for example "metro map", "Subway map", or even "rail map" - my funny litlle pastiche comes up in the first ten or pages of each.
I'm feeling a whole new book coming on: the evolution of a crazy design into a worldwide phenomenon!
Anyway just thought you map lovers might want to know. Enjoy!