I would never renounce my citizenship under any circumstances. I'm just too darn American. But I have friends who've worked abroad, and they have mostly positive experiences, so I'd be open to working outside the U.S. for a while.

One couple we know just spent four years teaching in Tunisia, and they had a blast. Now they've moved on to South Korea. I always open any email to them asking if they've learned how to play Starcraft yet. 'Cause, come on, you have to play Starcraft if you're in Korea, right? Isn't that a requirement?