vinf says "Would be especially useful if this would work with the Blackberry Google Maps application that I use all the time but I can't see a way to do that, overground rail networks and maybe bus routes would also be useful - but that would need a bit of detailed input from TfL (Transport for London) I would guess."
Thanks to McBazza and Simon G who both gave me the heads up for this.
The designer Samuel Arbesman says "This map is an attempt to approach our galaxy with a bit more familiarity than usual and get people thinking about long-term possibilities in outer space. Hopefully it can provide as a useful shorthand for our place in the Milky Way, the 'important' sights, and make inconceivable distances a bit less daunting.
I have attempted to actually make this map as accurate as possible, where each line corresponds to an arm of our galaxy, and the stations are actual places in their proper locations. However, I am not an astronomer or astrophysicist, so there are certainly inaccuracies, gaps, and room for improvement."
This is a great representation, but I wouldn't fancy trying the walk from Centaurus to Carina no matter how close they look on the map!