Or you could just be profitable in multiple currencies. Anyone who's building a web startup should realize they have a global business. It's a small amount of effort to provide a Canadian, Australian, and U.K. localized version if you're an English speaker.

Even if you're not concerned about the economy, there's no reason to not take advantage of foreign markets. StudiVZ, a straight-up clone of Facebook in Germany, was acquired for $100 million. How much more would Facebook be worth(really worth) if they had made an effort to go international sooner? Friendster is actually still alive, saved by foreign markets(they're huge in Asia).

If you're interested, I've written more about going global here: http://socialstrategist.com/2007/08/20/go-global-or-lose-one...