Station Maps -  a collection of 3D maps of London Underground/DLR stations
Great stuff and really interesting - I developed a lot of knowledge of shortcuts on the tube over 20 years of using it. They do like to send you the long way round with the signs! It's nice to visualise some of those shortcuts :)I'm slightly worried for you however as TFL and the Met seem to be cracking down on any open information about city infrastructure at the moment.