The best and most complete thread on this topic is over @ Reddit written by a tax attorney:
http://www.reddit.com/r/Bitcoin/comments/1uccfz/i_am_a_tax_a...
http://www.reddit.com/r/Bitcoin/comments/1uccfz/i_am_a_tax_a...
Without which, evasion becomes trivial for the wealthy.
You can offset taxes paid in foreign jurisdictions through a deduction or credit. You just can't set up a mailing address in a no tax jurisdiction to launder your earnings.