I was quoted in this article. I do lots and lots of this work -- helping people log out of the USA cleanly and permanently. AMA.
Here's something I've been wondering, totally hypothetical but could be real for someone else: Puerto Rico has this new tax law that basically limits taxes to like 4% or less, if you are a resident of PR. Let's say Bob is an American who expects to have a big exit in 2015 (or he has lots of GOOG stock and wants to sell it). Normally Bob would pay US capital gains taxes (15-20%, maybe 23.8%), plus California taxes (as…
(Note: I don't know specifically about Puerto Rico, but generally the above is the case for US citizens in foreign countries.)