From Shrinkage is Good:
As long as there have been taxes, there have been tax avoiders. And as long as there have been tax avoiders, there have been tax havens. Broadly speaking, any country that is known for helping individuals or businesses avoid taxes can be described as a tax haven.
Some are very forthcoming and proudly advertise the tax advantages of living there, while others are more discreet. In either case, tax havens have a long and enduring legacy in civil society (with an estimated $11.5 trillion currently stashed in offshore accounts) and each one offers something different to aspiring tax dodgers.
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More on taxes:
The 10 highest income tax states
How to handle yourself when the IRS calls your home
An excellent overview of which states are hurting the most tax-wise