If you've ever wondered how busy the oceans are, or where things are shipped to/from over the oceans, this is a fascinating map.  It lists the top 20 ports, as well as showing the top shipping lanes on the world's oceans.  You can also easily see the connection between wealthy nations (the US, Western European nations, China) and the number of ports/trade routes between them as opposed to South America, and Africa.

If you're gonna be lost at sea, and want the best chance of being found, the North Atlantic is definitely the place to do it.

Source: Pablo Kaluza et al., “The complex network of global cargo ship movements,” 1001.2172 (January 13, 2010), http://arxiv.org/abs/1001.2172.

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