For those who'd like to know more about Tax Havens, how corporations use them and the effect they have, I can thoroughly recommend Nicholas Shaxon's book, Treasure Islands [1]. For example, I never really considered why all my Amazon purchases mention Luxembourg.

[1] http://www.amazon.com/Treasure-Islands-Uncovering-Offshore-B...

(Disclaimer: That's an affiliate link via my college library. Feel free to strip it if you don't like such things)