I can hardly object to crossposting -- I got it from Heaneyland (http://www.yarnivore.com/francis/), and he got it from Boing Boing (http://boingboing.net/)...

Thanks for the pointer to cartographica! If London maps are your thing, Motco (http://www.motco.com/) have loads, and the world isn't short of wacky (http://www.geofftech.co.uk/tube/sillymaps/) tube (http://london-underground.blogspot.com/2005_06_01_london-underground_archive.html") maps (http://owen.massey.net/tubemaps.html) either.