Greg’s Cable Map:

All the Undersea Communications Cables in the World, harvested from Wikipedia. It would be really cool to see this by year of construction.
(ed. 5:21 pm, Greg writes:

That’s something I’m working on, it should be up in 2-3 weeks; I’m very busy with real work and won’t have much time to complete the task before the end of the month. Just keep an eye on the site, when I get that done, it’ll appear as an entry in the changelog.)

(Via James Fallows.)