Some may want to keep an eye on this October 2013 conference in San Diego which will focus on Canada/US/Mexico. One of the panels will have the Canadian Taxpayer Ombudsman, the US Taxpayer Advocate (Nina Olson), and the Mexican Taxpayer Advocate. Moderating that panel will be Roy Berg, Moodys Tax Advisors in Calgary.
From the Canadian Taxpayer Ombudsman, Government of Canada Taxpayers’ Ombudsman — Upholding Your Service Rights:
Information for Canadian citizens that are subject to American tax laws

