We have already seen some Isochronic maps here at Urban Demographics. This post shows a few more Travel Time Maps for other cities around the world.
- Mapnificent for more than 20 cities (tutorial video here)
- New York - Travel Times on Commuter Rail via (visual complexity)
- Isochronic London Underground (interactive)
- and the most attractive: Netherlands Isochronic Map (by Vincent Meertens via wired)